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HIV-1 is a highly host-specific retrovirus that infects humans but not most nonhuman primates. Thus, the lack of a suitable primate model that can be directly infected with HIV-1 hinders HIV-1/AIDS research. In the previous study, we have found that the northern pig-tailed macaques (NPMs) are susceptible to HIV-1 infection but show a nonpathogenic state. In this study, to understand this macaque–HIV-1 interaction, we assembled a de novo genome and longitudinal transcriptome for this species during the course of HIV-1 infection. Using comparative genomic analysis, a positively selected gene, Toll-like receptor 8, was identified with a weak ability to induce an inflammatory response in this macaque. In addition, an interferon-stimulated gene, interferon alpha inducible protein 27, was upregulated in acute HIV-1 infection and acquired an enhanced ability to inhibit HIV-1 replication compared with its human ortholog. These findings coincide with the observation of persistently downregulated immune activation and low viral replication and can partially explain the AIDS-free state in this macaque following HIV-1 infection. This study identified a number of unexplored host genes that may hamper HIV-1 replication and pathogenicity in NPMs and provided new insights into the host defense mechanisms in cross-species infection of HIV-1. This work will facilitate the adoption of NPM as a feasible animal model for HIV-1/AIDS research. [ABSTRACT FROM AUTHOR]

Background Despite recommendations that older adults receive acellular pertussis vaccines, data on direct effectiveness in adults aged over 50 years are sparse. Methods A case-control study nested within an adult cohort. Cases were identified from linked pertussis notifications and each matched to 3 controls on age, sex, and cohort recruitment date. Cases and controls were invited to complete a questionnaire, with verification of vaccination status by their primary care provider. Vaccine effectiveness (VE) was estimated by conditional logistic regression, with adjustment for reported contact with children and area of residence. Results Of 1112 notified cases in the cohort, we had complete data for 333 cases and 506 controls. Among 172 PCR-diagnosed cases (mean age, 61 years), 11.2% versus 19.5% of controls had provider-verified pertussis vaccination, on average, 3.2 years earlier. Adjusted VE against PCR-diagnosed pertussis was 52% (95% CI, 15–73%), nonsignificantly higher if vaccinated within 2 years (63%; −5–87%). Adjusted VE was similar in adults born before 1950, presumed primed by natural infection (51%; −8–77%) versus those born 1950 or later who may have received whole-cell pertussis vaccine (53%; −11–80%) (P -heterogeneity = 0.9). Among 156 cases identified by single-point serology, adjusted VE was −55% (−177–13%). Conclusions We found modest protection against PCR-confirmed pertussis among older adults (mean age, 61 years; range, 46–81 years) within 5 years after acellular vaccine. The most likely explanation for the markedly divergent VE estimate from cases identified by single-titer serology is misclassification arising from limited diagnostic specificity in our setting. [ABSTRACT FROM AUTHOR]

Background Inappropriate antibiotic use is a global health concern as it increases antibiotic resistance. Antibiotics are not routinely recommended for treating acute gastroenteritis, non-typhoidal salmonella and campylobacter infections. We investigated adherence to these recommendations in primary care. Methods We used a large electronic database of primary care records to identify presentations for acute gastroenteritis, non-typhoidal salmonella and campylobacter infections and antibiotic prescribing from 1st Jan 2013 to 31 December 2018. We estimated the proportions of cases prescribed antibiotics according to various characteristics and examined the antibiotics prescribed. Results A total of 86998, 1106, and 1952 participants were identified with acute gastroenteritis, non-typhoidal salmonella, and campylobacter infections and correspondingly 10% (8720/86998), 40% (437/1106), and 57% (1118/1952) of these cases were prescribed antibiotics in the period up to 5 days post-diagnosis. Patients residing in outer regional/remote areas and those from Northern Territory and Queensland were more likely to be prescribed antibiotics than those residing in major cities and those from other states (p < =0.04). No dominant antibiotic class was prescribed for acute gastroenteritis. Quinolones (28.6%) and macrolides (27.0%) were the most frequently prescribed antibiotics for non-typhoidal salmonella, and macrolides (69%) were the predominant antibiotics prescribed for campylobacter. Conclusion The high proportion of antibiotics dispensed in the general population with acute gastroenteritis, non-typhoidal salmonella and campylobacter infections suggests that antimicrobial stewardship needs to include better education and awareness around treatment guidelines for such infections. Key messages Antibiotics use was common for Australian population with acute gastroenteritis, particularly those with non-typhoidal salmonella and campylobacter infections. [ABSTRACT FROM AUTHOR]