Epidemiological Profile of Acute Viral Encephalitis
To study the etiology and clinico-epidemiological profile of acute viral encephalitis in children with acute encephalitis syndrome (AES).
An observational study including 100 patients fulfilling the criteria for AES was conducted in children of age group 1 mo – 16 y. Viral isolation was done on RD cells, HEp-2 cells and Vero cells from the cerebrospinal fluid samples of suspected viral encephalitis (VE) cases. An enzyme immunoassay for IgM antibodies was performed for measles, mumps, Varicella zoster virus (VZV), Herpes simplex virus 1 (HSV1) and Japanese encephalitis virus (JEV). Multiplex polymerase chain reaction (PCR) was done for Cytomegalovirus, Epstein Barr virus (EBV), HSV1 & 2, VZV, Enterovirus, Parecho virus, Human Herpes virus (HHV 6, 7) and Parvovirus B19. A micro neutralization test was performed for Enterovirus 71.
Out of enrolled 100 patients, 73 were of probable viral encephalitis. HSV1 (31.50%) was the commonest virus followed by Adenovirus (10.95%), Parvovirus (2.73%), JE virus (1.36%), Enterovirus (1.36%), EBV (1.36%), and mixed infection with HSV & EBV (1.36%). HSV 1 caused significant morbidity in children. The common computed tomography (CT) findings were hypodensities in the fronto- parietal lobe followed by cerebral edema.
The landscape of AES in India has changed in the previous decade, and both outbreak investigations and surveillance studies have increasingly reported non-JEV etiologies; because of these findings there is a need to explore additional strategies to prevent AES beyond vector control and JEV vaccination.
KeywordsAcute encephalitis syndrome Herpes simplex virus 1 Japanese encephalitis virus Multiplex PCR
All the authors contributed in study, manuscript formation and review of literature. RK will act as guarantor for this paper.
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- 1.World Health Organization. Acute encephalitis syndrome. Japanese encephalitis surveillance standards. 2006. From WHO-recommended standard for surveillance of selected vaccine-preventable disease. Available at: http://www.who.int/vaccines-documents/DocsPDF06/843.pdf. Accessed on 10/03/2014.
- 5.National vector borne disease control programme. Japanese encephalitis. AES/JE cases and deaths in the country since 2010. Available at: http://nvbdcp.gov.in/doc/je-aes-till-12May14.pdf. Accessed on 12/05/2014.
- 6.National vector borne disease control programme. Japanese encephalitis. What is the extent of problem of Japanese encephalitis in India? Available at: http://nvbdcp.gov.in. Accessed 22 March 2016.
- 7.Khinchi YR, Kumar A, Yadav S. Study of acute encephalitis syndrome in children. J College Med Sci-Nepal. 2010;6:7–13.Google Scholar
- 18.Sen PK, Dhariwal AC, Jaiswal RK, Lal S, Raina VK, Rastogi A. Epidemiology of acute encephalitis syndrome in india: changing paradigm and implication for control. J Commun Dis. 2014;46:4–11.Google Scholar