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Introduction: Acute encephalitis syndrome (AES) or acute febrile encephalopathy is a clinical condition characterized by altered mental status occurring after or along with a short febrile illness. In developing countries, infections are the predominant cause of AES. Prominent infections known to cause AES include viruses (such as herpes simplex virus [HSV], Japanese Encephalitis [JE] virus, dengue, enteroviruses [EVs]), bacteria, fungus, and parasites. In the present study, we aim to analyze the etiology, clinical features, and predictors of mortality in patients presenting with acute febrile encephalopathy or acute encephalitic syndrome. The present study was a prospective observational study conducted at Post Graduate Institute of Medical Education and Research a tertiary care center in Chandigarh, India. Methods: A total of 105 patients with ≥18 years of age with fever (body temperature >101° F for duration ≤14 days) and altered sensorium (Glasgow coma scale [GCS] score ≤10) lasting for more than 24 h, either accompanying the fever or following it were enrolled. Demographic and clinical details were recorded on pro forma. Cerebrospinal fluid (CSF) analysis was performed for all the enrolled patients at admission for cytology, CSF glucose to blood glucose ratio, protein levels, gram stain and culture sensitivity, adenosine deaminase levels, polymerase chain reaction for HSV/EV/mycobacterium tuberculosis (TB) and immunoglobulin M Enzyme‑linked immune assay for JE. Computed tomography of the brain was done in all patients while magnetic resonance imaging (MRI) of the brain was carried out in 75 patients. Results: Among the 105 patients, tubercular meningitis was seen in 27 (25.7%) patients followed by acute pyogenic meningitis in 18 (17.1%) patients. Probable viral encephalitis was present in 12 (11.4%) cases. Septic encephalopathy (n = 10) and scrub typhus encephalitis (n = 8), HSV encephalitis (n = 6), dengue encephalitis (n = 4), leptospirosis(n = 3) were the other infections causing acute febrile encephalitis in our study. In addition to fever and altered sensorium common symptoms observed were headache (52.4%), vomiting (35.2%), and seizures (29.5%). The factors predicting increased mortality were female gender, fever of more than 38°C at admission, GCS <7, MRI showing disease‑related findings like altered signal intensity bilateral medial temporal and insular area in herpes simplex encephalitis, etc., changes, and the group of patients where a definite diagnosis could not be established during the hospital stay. Conclusions: Tubercular meningitis/central nervous system TB is the predominant cause of acute febrile encephalopathy in developing countries. Scrub and dengue encephalitis are emerging as an important cause of acute febrile encephalopathy and occur predominantly in postmonsoon seasons. Acute febrile encephalopathy remains an important cause of mortality in patients presenting to Emergency Department (ER). The strongest predictors of mortality are low GCS and undiagnosed cases of AES. [ABSTRACT FROM AUTHOR]

Introduction: In recent years, scrub typhus has rapidly emerged to become the major cause of acute febrile illness (AFI) in India. The commonest tests used for diagnosis are serology and PCR. Therefore, the present study was planned to compare these two techniques in the diagnosis of scrub typhus. Aim of the study: To compare IgM ELISA and PCR for diagnosis of scrub typhus as a causative agent of AFI. Material and Methods: Patients with acute undiagnosed febrile illness presenting to the outpatient (OPD) or inpatient services of PGIMER Chandigarh between August 2013 and March 2014 were included in this study. Blood was collected for further analysis by IgM ELISA and nested PCR followed by Sanger sequencing. Result: Of 176 patients, 29 (16.4%) were positive for scrub typhus by nested PCR while 162 (92%) were positive by IgM ELISA. There was 59 % concordance between the two tests. Conclusion: This study report shows that the concordance between PCR and ELISA for the diagnosis of scrub typhus is less than 60%. Ideally, both tests should be performed to diagnose scrub typhus depending on the day of presentation to hospital. [ABSTRACT FROM AUTHOR]

Background To study the clinical profile and outcome of adult patients presenting with Scrub typhus ARDS in emergency at our institute. Methods Prospective observational study which included 126 adult patients presenting to emergency department at, PGIMER Chandigarh, a tertiary care referral institute in northwestern India with acute febrile illness with ARDS (acute onset respiratory distress within one week of fever or new/worsening respiratory symptoms with PaO2/FiO2 ratio less than 300 with PEEP or CPAP more than 5 cm H2O from January 2016 to December 2017.All the patients consenting for the study underwent detailed clinical evaluation and investigated for the etiology as per standard protocol followed at our institute with special emphasis to rule out tropical illnesses like scrub typhus, malaria, leptospirosis, dengue and H1N1 influenza. Patients were followed till discharge. Results Out of 126 patients eligible for the study, 45.2% were males and 54.8% were females. 47.6% were admitted in the monsoon/post-monsoon period. In addition to fever and dyspnea, cough (75.8%), hepatomegaly (56%), myalgia (63%), splenomegaly (31.3%), pedal edema (34.2%), pallor (40.4%), and vomiting (48.4%) were the common symptoms observed. Scrub typhus in 33.3%, followed by H1N1 influenza in 15.8%, co-infections in 12.6%, leptospirosis in (4.76%), dengue in (3.96%) and malaria in 3.17% of the patients, were the most common etiologies encountered. In 26.9% patients, no definite infective etiology could be found. Among the scrub typhus patients, 16 required ventilation. SOFA score of more than 6 was noted in 24 (57.14%) patients with scrub typhus as compared 9 (47.3%) patients with H1N1 infection. 12.1% of patients with scrub typhus succumbed to their illness when compared with 36.8% of patients with H1N1 infection. At admission in emergency female sex (P = 0.048), age less than 45 years, (P = 0.020), abdominal pain (P = 0.011), presence of hepatosplenomegaly (P = 0.001/0.010), thrombocytopenia <150,000 (P = 0.001), transaminitis (P = 0.00) were significant predictors of a diagnosis of scrub typhus when compared with a non-scrub typhus etiology of patients with fever and ARDS. Conclusion Scrub typhus is an important, treatable tropical infection causing ARDS especially in monsoon/post-monsoon seasons in Northwestern India. Disclosures All authors: No reported disclosures. [ABSTRACT FROM AUTHOR]

Background & objectives: In India, spotted fever group rickettsiae (SFGR) are an underdiagnosed cause of acute febrile illness (AFI). The non-specific Weil-Felix test is the first diagnostic modality for the diagnosis of SFGR in many laboratories due to the lack of advanced diagnostic facilities in developing countries. The aim of this study was to detect SFGR using molecular methods in the patients, presenting with AFI in a tertiary care centre in north India. Methods: Consecutive patients (>14 yr of age) with AFI were enrolled over a six month period. Standard investigations for common pathogens causing AFI in India (malaria, dengue, scrub typhus, leptospirosis and enteric fever) were carried out. In patients who were negative for all of the above investigations, blood was subjected to polymerase chain reaction (PCR) targeting outer membrane protein A (ompA) gene of Rickettsia. Results: Of the 51 patients with an undiagnosed aetiology, three were positive by ompA PCR. Two of the PCR products produced good sequences and BLAST identification confirmed them as Rickettsia conorii. The sequences of R. conorii reported from south India clustered with two previously reported novel rickettsial genotypes. The study sequences clustered in a group different from that of Rickettsia spp. of the south Indian sequences reported earlier. Interpretation & conclusions: This study showed the existence of R. conorii in north India. Testing for SFGR may be included in the diagnostic workup of AFI for better disease management. [ABSTRACT FROM AUTHOR]

• Scrub typhus shows a great diversity in its strains over a large geographical area of north India. • Most common strain in north India is Karp, followed by Gilliam. • Kato-like strains found in South of India were not found in the present study. Scrub typhus has emerged as a major cause of acute febrile illness in India in recent years. The causative agent, Orientia tsutsugamushi has more than 20 prototype strains due to a variable 56-kDa outer membrane protein. It is crucial to know the prevailing types in India for the success of diagnostic immunoassays and prospective vaccine candidates. In north India, the principal types circulating are largely unknown. Our tertiary care hospital caters to a large area of north India (around 7 states and one union territory). Therefore, the current study was planned to identify the genotypes of O. tsutsugamushi strains circulating in this wide area of north India. Adults and children presenting with suspected scrub typhus between July 2013 and December 2013 were included in this study. DNA was extracted from whole blood and a nested PCR was used to amplify a 483-bp region of the 56-kDa antigen gene of O. tsutsugamushi. The PCR products were purified and DNA sequencing was performed and aligned using the CLUSTAL_X2 program. A phylogenetic tree was constructed using neighbour- joining algorithms and analysed using the sequences obtained in this study and those obtained from the GenBank database. A total of 34 samples were positive for PCR. The amplicons were sequenced and analyzed. Karp-like strains predominated in all states studied (64.7%) followed by Gilliam-like (26.47 %) and 8.82% similar to Hualien 1 or S072. We did not find any Kato or Kawasaki-like strain. Karp like strains showed >99% similarity to TH2033, TH2191, TH2208, Xinjiang & Neimeng strains and Gilliam-like strains showed >99% similarity to Clone ISS -11. Orientia tsutsugamushi shows a great diversity in its strains over a large geographical area of north India. This has implications in the production of both diagnostic assays and vaccine for scrub typhus. [ABSTRACT FROM AUTHOR]