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  • Title: Infectious causes of acute encephalitis syndrome hospitalizations in Central India, 2018-20.
    Author: Tandale BV, Tomar SJ, Bondre VP, Sapkal GN, Damle RG, Narang R, Qazi MS, Goteti PV, Jain M, Jain D, Guduru VK, Jain J, Gosavi RV, Sekhar VC, Study-Group IE, Pavitrakar DV, Shankarraman V, Mahamuni SA, Salunkhe A, Khude P, Deshmukh PS, Deshmukh PR, Raut AV, Niswade AK, Bansod YV, Narlawar UW, Talapalliwar M, Rathod P, Jha PK, Rao RK, Jyothi K, B PS, M PK, K J KK, Taksande A, Kumar S, Mudey G, Yelke BS, Kamble M, Tankhiwale S.
    Journal: J Clin Virol; 2022 Aug; 153():105194. PubMed ID: 35687988.
    Abstract:
    BACKGROUND: We enhanced surveillance of hospitalizations of all ages for acute encephalitis syndrome (AES) along with infectious aetiologies, including the Japanese encephalitis virus (JEV). METHODS: From October 2018 to September 2020, we screened neurological patients for AES in all age groups in Maharashtra and Telangana States. AES cases were enrolled at study hospitals along with other referrals and sampled with cerebrospinal fluid, acute and convalescent sera. We tested specimens for non-viral aetiologies viz. leptospirosis, typhoid, scrub typhus, malaria and acute bacterial meningitis, along with viruses - JEV, Dengue virus (DENV), Chikungunya virus (CHIKV), Chandipura virus (CHPV) and Herpes simplex virus (HSV). RESULTS: Among 4977 neurological hospitalizations at three study site hospitals over two years period, 857 (17.2%) were AES. However, only 287 (33.5%) AES cases were eligible. Among 278 (96.9%) enrolled AES cases, infectious aetiologies were identified in 115 (41.4%) cases, including non-viral in 17 (6.1%) cases - leptospirosis (8), scrub-typhus (3) and typhoid (6); and viral in 98 (35.3%) cases - JEV (58, 20.9%), HSV (22, 7.9%), DENV (15, 5.4%) and CHPV (3, 1.1%). JEV confirmation was significantly higher in enrolled cases than referred cases (10.2%) (p < 0.05). However, the contribution of JEV in AES cases was similar in both children and adults. JE was reported year-round and from adjacent non-endemic districts. CONCLUSIONS: The Japanese encephalitis virus continues to be the leading cause of acute encephalitis syndrome in central India despite vaccination among children. Surveillance needs to be strengthened along with advanced diagnostic testing for assessing the impact of vaccination.
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