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Background: Left ventricular noncompaction (LVNC) is characterized by excessive trabeculations of the LV and may be associated with reduced systolic function or severe adverse outcomes. Several aspects remain to be elucidated; there is controversy to whether LVNC cardiomyopathy is a distinct cardiomyopathy caused by failure of the spongy fetal myocardium to condense during fetal development or acquired later in life as a morphological trait associated with other types of cardiomyopathy; the prevalence in unselected populations is unknown and the distinction between normal variation and pathology remains to be defined. In this study, we aimed to determine the prevalence of LVNC and the association to LV systolic function in a large, population-based cohort of neonates. In addition, we assessed the normal ratio of noncompact to compact (NC:C) myocardium in 150 healthy neonates. Methods: Echocardiographic data were prospectively collected in the population study Copenhagen Baby Heart Study. The ratio of NC:C was measured in 12 ventricular segments. LVNC was defined as NC:C ≥2 in at least one segment. Neonates with LVNC were matched 1:10 to controls on sex, gestational age, and weight and age at the examination day. Results: In total, 25 590 neonates (52% males, median age 11 [interquartile range, 7–15] days) underwent echocardiography. Among 21 133 with satisfactory visualization of ventricular segments, we identified a prevalence of LVNC of 0.076% (95% CI, 0.047–0.123). LV ejection fraction was lower in neonates with LVNC compared with matched controls (median 49.5 versus 59.0%; P Conclusions: The prevalence of LVNC based on neonatal echocardiography was 0.076%. LVNC was associated with lower LV systolic function. The findings in normal newborns support the cutoff NC:C ≥2 as an appropriate diagnostic criterion. Registration: URL: https://www.clinicaltrials.gov ; Unique identifier: NCT02753348.

Objectives: Antibodies to severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) are a key factor in protecting against coronavirus disease 2019 (COVID-19). We examined longitudinal changes in seroprevalence in healthcare workers (HCWs) in Copenhagen and the protective effect of antibodies against SARS-CoV-2. Methods: In this prospective study, screening for antibodies against SARS-CoV-2 (ELISA) was offered to HCWs three times over 6 months. HCW characteristics were obtained by questionnaires. The study was registered at ClinicalTrials.gov, NCT04346186. Results: From April to October 2020 we screened 44 698 HCWs, of whom 2811 were seropositive at least once. The seroprevalence increased from 4.0% (1501/37 452) to 7.4% (2022/27 457) during the period (p < 0.001) and was significantly higher than in non-HCWs. Frontline HCWs had a significantly increased risk of seropositivity compared to non-frontline HCWs, with risk ratios (RRs) at the three rounds of 1.49 (95%CI 1.34–1.65, p < 0.001), 1.52 (1.39–1.68, p < 0.001) and 1.50 (1.38–1.64, p < 0.001). The seroprevalence was 1.42- to 2.25-fold higher (p < 0.001) in HCWs from dedicated COVID-19 wards than in other frontline HCWs. Seropositive HCWs had an RR of 0.35 (0.15–0.85, p 0.012) of reinfection during the following 6 months, and 2115 out of 2248 (95%) of those who were seropositive during rounds one or two remained seropositive after 4–6 months. The 133 of 2248 participants (5.0%) who seroreverted were slightly older and reported fewer symptoms than other seropositive participants. Conclusions: HCWs remained at increased risk of infection with SARS-CoV-2 during the 6-month period. Seropositivity against SARS-CoV-2 persisted for at least 6 months in the vast majority of HCWs and was associated with a significantly lower risk of reinfection.

Background People experiencing homelessness (PEH) and associated shelter workers may be at higher risk of infection with “Severe acute respiratory syndrome coronavirus 2” (SARS-CoV-2). The aim of this study was to determine the prevalence of SARS-CoV-2 among PEH and shelter workers in Denmark. Design and methods In November 2020, we conducted a nationwide cross-sectional seroprevalence study among PEH and shelter workers at 21 recruitment sites in Denmark. The assessment included a point-of-care test for antibodies against SARS-CoV-2, followed by a questionnaire. The seroprevalence was compared to that of geographically matched blood donors considered as a proxy for the background population, tested using a total Ig ELISA assay. Results We included 827 participants in the study, of whom 819 provided their SARS-CoV-2 antibody results. Of those, 628 were PEH (median age 50.8 (IQR 40.9–59.1) years, 35.5% female) and 191 were shelter workers (median age 46.6 (IQR 36.1–55.0) years and 74.5% female). The overall seroprevalence was 6.7% and was similar among PEH and shelter workers (6.8% vs 6.3%, p = 0.87); and 12.2% among all participants who engaged in sex work. The overall participant seroprevalence was significantly higher than that of the background population (2.9%, p p = 0.02). Seropositive and seronegative participants reported a similar presence of at least one SARS-CoV-2 associated symptom (49% and 54%, respectively). Interpretations The prevalence of SARS-CoV-2 antibodies was more than twice as high among PEH and associated shelter workers, compared to the background population. These results could be taken into consideration when deciding in which phase PEH are eligible for a vaccine, as part of the Danish national SARS-CoV-2 vaccination program rollout. Funding TrygFonden and HelseFonden.

Introduction: Left ventricular non-compaction (LVNC) is characterized by excessive trabeculations of the left ventricular wall and may be associated with reduced systolic function. It is debated whether LVNC is congenital or may develop later as part of other cardiomyopathies. The clinical importance and heredity of LVNC with normal systolic function is unclear. We aimed to describe the cardiac development in children with LVNC from birth to 2-4 years of age, compared to matched controls. Additionally, we aimed to describe the prevalence of LVNC in first-degree relatives. Methods: A follow-up transthoracic echocardiography was performed in children at 2-4 years of age diagnosed with LVNC at birth ( Results: Of the 16 children diagnosed with LVNC at birth, 10 have been reevaluated (age 3.5 (interquartile range (IQR) 3, 4) years, 80% male) together with 20 matched controls (age 4 (IQR 3, 4) years, 70% male), 29 first-degree relatives in case group (age 29 (IQR 4, 35) years, 45% male) and 55 first-degree relatives in control group (age 32 (IQR 11, 36) years, 51% male). In probands, the extent of trabeculation (13% vs. 12%, p=0.97) and fractional shortening (FS) (29% vs. 31%, p=0.24) were unchanged from birth to follow-up. At follow-up, the median left ventricular FS was significantly lower in probands compared to matched controls (31% vs. 33%, p=0.03). Ten (35%) first-degree relatives to probands fulfilled criteria for LVNC compared to 0 (0%) of first-degree relatives to controls (p Conclusions: Children with LVNC diagnosed neonatally as part of a population study had no further progression of left ventricular dysfunction or extent of trabeculation at the age of 2-4 years, but systolic function was reduced compared to matched controls. One third of first-degree relatives to children with LVNC fulfilled criteria for LVNC.

Most individuals seroconvert after infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), but being seronegative is observed in 1 to 9%. We aimed to investigate the risk factors associated with being seronegative following PCR-confirmed SARS-CoV-2 infection. In a prospective cohort study, we screened health care workers (HCW) in the Capital Region of Denmark for SARS-CoV-2 antibodies. We performed three rounds of screening from April to October 2020 using an enzyme-linked immunosorbent assay (ELISA) method targeting SARS-CoV-2 total antibodies. Data on all participants’ PCR for SARS-CoV-2 RNA were captured from national registries. The Kaplan-Meier method and Cox proportional hazards models were applied to investigate the probability of being seronegative and the related risk factors, respectively. Of 36,583 HCW, 866 (2.4%) had a positive PCR before or during the study period. The median (interquartile range [IQR]) age of 866 HCW was 42 (31 to 53) years, and 666 (77%) were female. After a median of 132 (range, 35 to 180) days, 21 (2.4%) of 866 were seronegative. In a multivariable model, independent risk factors for being seronegative were self-reported asymptomatic or mild infection hazard ratio (HR) of 6.6 (95% confidence interval [CI], 2.6 to 17; P < 0.001) and body mass index (BMI) of ≥30, HR 3.1 (95% CI, 1.1 to 8.8; P = 0.039). Only a few (2.4%) HCW were not seropositive. Asymptomatic or mild infection as well as a BMI above 30 were associated with being seronegative. Since the presence of antibodies against SARS-CoV-2 reduces the risk of reinfection, efforts to protect HCW with risk factors for being seronegative may be needed in future COVID-19 surges. IMPORTANCE Most individuals seroconvert after infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), but negative serology is observed in 1 to 9%. We found that asymptomatic or mild infection as well as a BMI above 30 were associated with being seronegative. Since the presence of antibodies against SARS-CoV-2 reduces the risk of reinfection, efforts to protect HCW with risk factors for being seronegative may be needed in future COVID-19 surges.

BackgroundNational data on the spread of SARS-CoV-2 infection and knowledge on associated risk factors are important for understanding the course of the pandemic. “Testing Denmark” is a national large-scale epidemiological surveillance study of SARS-CoV-2 in the Danish population.MethodsBetween September and October 2020, approximately 1.3 million of 5.8 million Danish citizens (age > 15 years) were randomly invited to fill in an electronic questionnaire covering COVID-19 exposures and symptoms. The prevalence of SARS-CoV-2 antibodies was determined by Point-of Care rapid Test (POCT) distributed to participants home addresses.FindingsIn total 318,552 participants (24.5% invitees) completed the questionnaire and provided the result of the POCT. Of these, 2,519 (0.79%) were seropositive (median age 55 years) and women were more often seropositive than men, interquartile range (IQR) 42-64, 40.2% males. Of participants with a prior positive Polymerase Chain Reaction (PCR) test (n=1,828), 29.1% were seropositive in the POCT. Seropositivity increased with age irrespective of sex. Elderly participants (>61 years) reported less symptoms and had less frequently been tested for SARS-CoV-2 compared to younger participants. Seropositivity was associated with physical contact with SARS-CoV-2 infected individuals (Risk ratio (RR) 7.43, 95% CI: 6.57-8.41) and in particular household members (RR 17.70, 95% CI: 15.60-20.10). Home care workers had a higher risk of seropositivity (RR 2.09 (95% CI: 1.58-2.78) as compared to office workers. Geographic population density was not associated to seropositivity. A high degree of compliance with national preventive recommendations was reported (e.g., > 80% use of face masks), but no difference was found between seropositive and seronegative participants.InterpretationThis study provides insight into the immunity of the Danish population seven to eight months after the first COVID-19 case in Denmark. The seroprevalence was lower than expected probably due to a low sensitivity of the POCT used or due to challenges relating to the reading of test results. Occupation or exposure in local communities were major routes of infection. As elderly participants were more often seropositive despite fewer symptoms and less PCR tests performed, more emphasis should be placed on testing this age group.

BackgroundPeople experiencing homelessness (PEH) and associated shelter workers may be at higher risk of infection with “Severe acute respiratory syndrome coronavirus 2” (SARS-CoV-2). The aim of this study was to determine the prevalence of SARS-CoV-2 among PEH and shelter workers in Denmark.Design and methodsIn November 2020, we conducted a nationwide cross-sectional seroprevalence study among PEH and shelter workers at 21 recruitment sites in Denmark. The assessment included a point-of-care test for antibodies against SARS-CoV-2, followed by a questionnaire. The seroprevalence was compared to that of geographically matched blood donors considered as a proxy for the background population, tested using a total Ig ELISA assay.ResultsWe included 827 participants in the study, of whom 819 provided their SARS-CoV-2 antibody results. Of those, 628 were PEH (median age 50.8 (IQR 40.9-59.1) years, 35.5% female) and 191 were shelter workers (median age 46.6 (IQR 36.1-55.0) years and 74.5% female). The overall seroprevalence was 6.7% and was similar among PEH and shelter workers (6.8% vs 6.3%, p=0.87); and 12.2% among all participants who engaged in sex work. The overall participant seroprevalence was significantly higher than that of the background population (2.9%, p InterpretationsThe prevalence of SARS-CoV-2 antibodies was more than twice as high among PEH and associated shelter workers, compared to the background population. The subset of the study participants who were also sex workers were at particularly high risk of COVID-19 infection.FundingTrygFonden and HelseFonden.

BackgroundCOVID-19 is suggested to be more prevalent among ethnic minorities and individuals with low socioeconomic status. We aimed to investigate the prevalence of SARS-CoV-2 antibodies during the COVID-19 pandemic among citizens 15 years or older in Denmark living in social housing (SH) areas.MethodsAs part of “Testing Denmark”, a nationwide sero-epidemiological surveillance survey, we conducted a study between January 8th and January 31st, 2021 with recruitment in 13 selected SH areas in Denmark. Participants were offered a point-of-care rapid SARS-CoV-2 IgM and IgG antibody test and a questionnaire concerning previous testing (viral throat- and nasopharyngeal swab or antibody test), test results for COVID-19, demographics, household characteristics, employment, risk factors for SARS-CoV-2 infection and history of symptoms associated with COVID-19. Data on seroprevalence from Danish blood donors in same period using a total Ig ELISA assay were used as a proxy for the general Danish population.FindingsOf the 13,279 included participants, 2,296 (17.3%) were seropositive (mean age 46.6 (SD 16.4) years, 54.2% female), which was 3 times higher than in the general Danish population (mean age 41.7 (SD 14.1) years, 48.5% female) in the same period (5.8%, risk ratios (RR) 2.96, 95% CI 2.78-3.16, p>0.001). Seropositivity was higher among males than females (RR 1.1, 95% CI 1.05-1.22%, p=0.001) and increased with age, with an OR seropositivity of 1.03 for each 10-year increase in age (95% CI 1.00-1.06, p=0.031). Close contact with COVID-19-infected individuals was associated with a higher risk of infection, especially among members of the same households (OR 5.0, 95% CI 4.1-6.2 pInterpretationDanish citizens living in SH areas of low socioeconomic status had a three times higher SARS-CoV-2 seroprevalence compared to the general Danish population. The seroprevalence was significantly higher in males and increased with age. Living in multiple generations or more than four persons in a household was an independent risk factor for being seropositive. Results of this study can be used for future consideration of the need for preventive measures in the populations living in SH areas.

Serological assays for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are needed to support clinical diagnosis and epidemiological investigations. Recently, assays for large-scale detection of total antibodies (Ab), immunoglobulin G (IgG), and IgM against SARS-CoV-2 antigens have been developed, but there are limited data on the diagnostic accuracy of these assays., Serological assays for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are needed to support clinical diagnosis and epidemiological investigations. Recently, assays for large-scale detection of total antibodies (Ab), immunoglobulin G (IgG), and IgM against SARS-CoV-2 antigens have been developed, but there are limited data on the diagnostic accuracy of these assays. This study was a Danish national collaboration and evaluated 15 commercial and one in-house anti-SARS-CoV-2 assays in 16 laboratories. Sensitivity was evaluated using 150 samples from individuals with asymptomatic, mild, or moderate COVID-19, nonhospitalized or hospitalized, confirmed by nucleic acid amplification tests (NAAT); samples were collected 13 to 73 days either from symptom onset or from positive NAAT (patients without symptoms). Specificity and cross-reactivity were evaluated in samples collected prior to the SARS-CoV-2 epidemic from >586 blood donors and patients with autoimmune diseases, cytomegalovirus or Epstein-Barr virus infections, and acute viral infections. A specificity of ≥99% was achieved by all total-Ab and IgG assays except one, DiaSorin Liaison XL IgG (97.2%). Sensitivities in descending order were Wantai ELISA total Ab (96.7%), CUH-NOVO in-house ELISA total Ab (96.0%), Ortho Vitros total Ab (95.3%), YHLO iFlash IgG (94.0%), Ortho Vitros IgG (93.3%), Siemens Atellica total Ab (93.2%), Roche Elecsys total Ab (92.7%), Abbott Architect IgG (90.0%), Abbott Alinity IgG (median 88.0%), DiaSorin Liaison XL IgG (median 84.6%), Siemens Vista total Ab (81.0%), Euroimmun/ELISA IgG (78.0%), and Snibe Maglumi IgG (median 78.0%). However, confidence intervals overlapped for several assays. The IgM results were variable, with the Wantai IgM ELISA showing the highest sensitivity (82.7%) and specificity (99%). The rate of seropositivity increased with time from symptom onset and symptom severity.

Observational evidence suggests that mask wearing mitigates SARS-CoV-2 transmission. It is uncertain if this observed association arises through protection of uninfected wearers (protective effect), via reduced transmission from infected mask wearers (source control), or both. This randomized controlled trial investigates whether recommending surgical mask use when outside the home reduces wearers' risk for SARS-CoV-2 infection in a setting where masks were uncommon and not among recommended public health measures., Visual Abstract. Effectiveness of Mask Recommendation for Preventing SARS-CoV-2 Infection Observational evidence suggests that mask wearing mitigates SARS-CoV-2 transmission. It is uncertain if this observed association arises through protection of uninfected wearers (protective effect), via reduced transmission from infected mask wearers (source control), or both. This randomized controlled trial investigates whether recommending surgical mask use when outside the home reduces wearers' risk for SARS-CoV-2 infection in a setting where masks were uncommon and not among recommended public health measures. Visual Abstract. Effectiveness of Mask Recommendation for Preventing SARS-CoV-2 Infection Observational evidence suggests that mask wearing mitigates SARS-CoV-2 transmission. It is uncertain if this observed association arises through protection of uninfected wearers (protective effect), via reduced transmission from infected mask wearers (source control), or both. This randomized controlled trial investigates whether recommending surgical mask use when outside the home reduces wearers' risk for SARS-CoV-2 infection in a setting where masks were uncommon and not among recommended public health measures., Background: Observational evidence suggests that mask wearing mitigates transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). It is uncertain if this observed association arises through protection of uninfected wearers (protective effect), via reduced transmission from infected mask wearers (source control), or both. Objective: To assess whether recommending surgical mask use outside the home reduces wearers' risk for SARS-CoV-2 infection in a setting where masks were uncommon and not among recommended public health measures. Design: Randomized controlled trial (DANMASK-19 [Danish Study to Assess Face Masks for the Protection Against COVID-19 Infection]). (ClinicalTrials.gov: NCT04337541) Setting: Denmark, April and May 2020. Participants: Adults spending more than 3 hours per day outside the home without occupational mask use. Intervention: Encouragement to follow social distancing measures for coronavirus disease 2019, plus either no mask recommendation or a recommendation to wear a mask when outside the home among other persons together with a supply of 50 surgical masks and instructions for proper use. Measurements: The primary outcome was SARS-CoV-2 infection in the mask wearer at 1 month by antibody testing, polymerase chain reaction (PCR), or hospital diagnosis. The secondary outcome was PCR positivity for other respiratory viruses. Results: A total of 3030 participants were randomly assigned to the recommendation to wear masks, and 2994 were assigned to control; 4862 completed the study. Infection with SARS-CoV-2 occurred in 42 participants recommended masks (1.8%) and 53 control participants (2.1%). The between-group difference was −0.3 percentage point (95% CI, −1.2 to 0.4 percentage point; P = 0.38) (odds ratio, 0.82 [CI, 0.54 to 1.23]; P = 0.33). Multiple imputation accounting for loss to follow-up yielded similar results. Although the difference observed was not statistically significant, the 95% CIs are compatible with a 46% reduction to a 23% increase in infection. Limitation: Inconclusive results, missing data, variable adherence, patient-reported findings on home tests, no blinding, and no assessment of whether masks could decrease disease transmission from mask wearers to others. Conclusion: The recommendation to wear surgical masks to supplement other public health measures did not reduce the SARS-CoV-2 infection rate among wearers by more than 50% in a community with modest infection rates, some degree of social distancing, and uncommon general mask use. The data were compatible with lesser degrees of self-protection. Primary Funding Source: The Salling Foundations.

Serological SARS-CoV-2 assays are needed to support clinical diagnosis and epidemiological investigations. Recently, assays for the large-volume detection of total antibodies (Ab) and immunoglobulin (Ig) G and M against SARS-CoV-2 antigens have been developed, but there are limited data on the diagnostic accuracy of these assays. This study was organized as a Danish national collaboration and included fifteencommercial and one in-house anti-SARS-CoV-2 assays in sixteen laboratories. Sensitivity was evaluated using 150 serum samples from individuals diagnosed with asymptomatic,mild or moderate nonhospitalized (n=129) or hospitalized (n=31) COVID-19, confirmed bynucleic acid amplification tests, collected 13-73 days from symptom onset. Specificity and cross-reactivity were evaluated in samples collected prior to the SARS-CoV-2 epidemic from > 586 blood donors and patients with autoimmune diseases or CMV or EBV infections. Predefined specificity criteria of ≥ 99% were met by all total-Ab and IgG assays except one (Diasorin/LiaisonXL-IgG 97.2%). The sensitivities in descending order were: Wantai/ELISA total-Ab (96.7%), CUH/NOVO in-house ELISA total-Ab (96.0%), Ortho/Vitros total-Ab (95.3%), YHLO/iFlash-IgG (94.0%), Ortho/Vitros-IgG (93.3%), Siemens/Atellica total-Ab (93.2%), Roche-Elecsys total-Ab (92.7%), Abbott-Architect-IgG (90.0%), Abbott/Alinity-IgG (median 88.0%), Diasorin/LiaisonXL-IgG (84.6%),Siemens/Vista total-Ab (81.0%), Euroimmun/ELISA-IgG (78.0%), and Snibe/Maglumi-IgG (median 78.0%). The IgM results were variable, but one assay (Wantai/ELISA-IgM) hadboth high sensitivity (82.7%) and specificity (99%). The rate of seropositivity increased with time from symptom onset and symptom severity. In conclusion, predefined sensitivity and specificity acceptance criteria of 90%/99%, respectively, for diagnostic use were met in five of six total-Ab and three of seven IgG assays.

Background Ventricular septal defect (VSD) is one of the most common congenital heart defects. Some VSDs close spontaneously while persistence of the VSD may result in heart failure and, at long term, irreversible pulmonary hypertension. Consequently, identification of factors associated with spontaneous closure are important to ensure relevant clinical follow up of those at risk of a persistent VSD. Purpose We aimed to assess the rate of spontaneous closure in a population-based cohort of newborns with VSD and to identify significant predictors for spontaneous closure. Methods The study is part of a large-scale population-based study, focusing on cardiac structure and function, including newborns born from 1st April 2016 to 31st October 2018. Newborns with a VSDs at baseline were followed with echocardiography at 3, 6 and 12 months (+30 days) of age. Cox proportional hazard model was used to determine significant predictors of spontaneous closure Results Based on echocardiographies of 25.750 newborn, 850 newborns (3.3%) with a VSD were identified. The majority of newborns with VSDs were born at term (88.7%) and the mean age at inclusion was 11.7±8.1 days. VSDs were more frequent in females (57.1%, p Conclusion In a population study including more than 25,000 newborns we found that the vast majority, i.e. almost 9/10 of all VSDs, closed spontaneously during the first year of life, ultimately resulting in a prevalence of VSD in one-year old children of 0.5%. The identified factors associated with spontaneous closure – anatomical location, size and presence of multiple VSDs are of use for future management of VSDs in newborns. Funding Acknowledgement Type of funding source: Other. Main funding source(s): The Danish Heart Foundation

Background Primary cardiac tumours in children are rare, with an estimated prevalence of 0.014% in foetuses, whereas in the paediatric population, a 100-fold difference in autopsy prevalence has been reported (0.0017% to 0.28%). In neonates, rhabdomyoma is the most common primary cardiac tumour, followed by teratoma and fibroma, all of which are benign. Cardiac rhabdomyomas are associated to tuberous sclerosis in >50% of cases. The prevalence of cardiac tumours in neonates has not previously been assessed in a large population-based cohort. Purpose To determine the prevalence of congenital cardiac tumours by systematic echocardiography in a large, population-based, cohort of neonates. Methods Systematic transthoracic echocardiography (TTE), including standard sub-xiphoid, apical, left parasternal, and suprasternal views, was performed in neonates included in a population study. Cardiac tumours were defined as solid, echogenic masses, and description included location, size, and numbers (one/multiple). Information regarding subsequent diagnosis of tuberous sclerosis was collected from review of medical charts. Results A total of 25,537 neonates (age 12±9 days, 51.6% male) were enrolled in the study and underwent TTE. Cardiac tumours were detected in 7 neonates (4 males), corresponding to a prevalence of 0.3 [0.1; 0.6] per 1,000 live-births. Characteristics including sex, gestational age at birth, birth length and weight, APGAR 5-score, age and weight at TTE, and maternal age and pre-pregnancy BMI, did not significantly differ between the neonates with (n=7) and without (n=25,530) cardiac tumours (all p>0.05). In 6 out of 7 neonates, the cardiac tumours were located in the ventricles (86%), with multiple tumours seen in five (83%) (Fig. 1A+B), and with size ranging from 2.0x1.9mm to 10.0x5.1mm. In the seventh neonate, two cardiac tumours were detected in close proximity to the aortic and pulmonary valves in the ascending aortic and main pulmonary artery wall (Fig. 1C), with sizes 5.1x4.7mm and 3.7x3.2mm, respectively. All seven neonates had otherwise structurally normal hearts and no flow obstruction. Three neonates with multiple cardiac tumours in the ventricles were subsequently diagnosed with tuberous sclerosis. Conclusions Systematic TTE in a population-based cohort revealed a prevalence of congenital cardiac tumours of 0.3 per 1,000 live-births. The majority of the tumours were located in the ventricles and most often multiple cardiac tumours were encountered. Detection of congenital cardiac tumours in the ventricles was associated with tuberous sclerosis in half the cases. Funding Acknowledgement Type of funding source: Foundation. Main funding source(s): Danish Heart Association, Danish Children's Heart Foundation

Summary Background Health-care workers are thought to be highly exposed to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. We aimed to investigate the prevalence of antibodies against SARS-CoV-2 in health-care workers and the proportion of seroconverted health-care workers with previous symptoms of COVID-19. Methods In this observational cohort study, screening was offered to health-care workers in the Capital Region of Denmark, including medical, nursing, and other students who were associated with hospitals in the region. Screening included point-of-care tests for IgM and IgG antibodies against SARS-CoV-2. Test results and participant characteristics were recorded. Results were compared with findings in blood donors in the Capital Region in the study period. Findings Between April 15 and April 23, 2020, we screened 29 295 health-care workers, of whom 28 792 (98·28%) provided their test results. We identified 1163 (4·04% [95% CI 3·82–4·27]) seropositive health-care workers. Seroprevalence was higher in health-care workers than in blood donors (142 [3·04%] of 4672; risk ratio [RR] 1·33 [95% CI 1·12–1·58]; p

Background Pronounced trabeculation of the left ventricular myocardium, or non-compaction, may be accompanied by systolic dysfunction in ventricular non-compaction cardiomyopathy (LVNC). It is unclear whether non-compaction represents a fetal development defect or may develop later in life. Previous studies have estimated the prevalence of non-compaction to 0.01–0.31% in adults referred for echocardiography. The prevalences in unselected populations of adults or children are unknown. Purpose To determine the prevalence of non-compaction of the left ventricle in a large population-based cohort of newborns and to assess the relation to left ventricular systolic function. Methods Transthoracic echocardiography was performed according to a standardized protocol in all newborns included in a regional population-based cohort study in 2016–2018. For the present study, the extent of trabeculations were assessed by one of three primary reviewers in apical long-axis views (4-chamber, 5-chamber, and sinus coronarius views), parasternal short (SAX), and long axis (PLAX) views. Based on the presence of pronounced trabeculations, deep intertrabecular recesses and/or an impression of a ratio of >1 of non-compact:compact myocardium (NC:C), the exam was regarded as either possible or not possible non-compaction: In examinations classified as possible non-compaction, an expert reviewer would determine if diagnostic criteria were fulfilled. A ratio of NC:C myocardium ≥2 was considered as non-compaction in accordance with previously suggested criteria. Results As of January 11, 2019, 6,880 neonate echocardiograms (median age 10 days [IQR 5,14], 48.8% females) had been analyzed. In total, 127 (1.8%) were considered as possible non-compaction. Six newborns (median age 14 days [IQR 8,18], 33.3% females) had a ratio of NC:C myocardium ≥2 corresponding to a prevalence of non-compaction of 8.7 per 10,000 newborns (95% CI 0.04–0.19%) (Figure). One of six neonates had a ratio of NC:C myocardium≥2 in more than one segment. Median fractional shortening (FS %), left ventricular end-diastolic (LVIDd) and end-systolic diameter (LVIDs) were 29.5% (IQR 27.0, 31.0), 1.9 cm (IQR 1.8, 2.1) and 1.3 cm (IQR 1.3, 1.5) respectively in the six newborns with non-compaction. The corresponding mean z-scores (standard deviations away from the age-matched reference mean) according to The Boston Children's Hospital z-score Calculator were FS: r=−3.0 (IQR r=−3.8, r=−2.5), LVIDd: r=−1.3 (IQR r=−2.7, r=−0.2), LVIDs: 0.2 (IQR r=−0.1, 1.6). 10-days-old boy with LVNC (FS 22%) Conclusion Echocardiography of an unselected population-based cohort of 6,880 newborns revealed a prevalence of non-compaction of 8.7 per 10,000 newborns. The prevalence is in accordance with previously described prevalences in adults referred for echocardiography and corroborate the view that non-compaction may be a fetal developmental defect. Non-compaction was not associated with left ventricular dilatation but with systolic dysfunction. Acknowledgement/Funding Danish Heart Association, Danish Children's Heart Foundation, Candy's Found., Toyota Found., Herlev-Gentofte Hospital Research Found., Gangsted Found.