Investigation of a hepatitis A outbreak from Shimla Himachal Pradesh

Chobe, L. P. ; Arankalle, V. A. (2009) Investigation of a hepatitis A outbreak from Shimla Himachal Pradesh Indian Journal of Medical Research, 130 . pp. 179-184. ISSN 0019-5340

PDF - Publisher Version

Official URL:


Background & objective: Hepatitis A is an enterically transmitted viral disease, highly prevalent in India and mainly presents as a paediatric sporadic disease. This study investigated an outbreak of viral hepatitis at Shimla, Himachal Pradesh, India, during January-March 2007. Methods: Eighty seven blood samples, 3 water samples and 2 sewage samples were collected. Serum samples were tested for IgM and IgG anti HAV and IgM and IgG anti HEV antibodies. Serum, sewage and water samples were tested for HAV-RNA by nested RT-PCR. Nearly complete full genome (excluding extreme 5' end) was amplified from one serum sample. Results: The hepatitis cases were mainly seen among children and young adults and 63.2 per cent (55/88) were positive for anti-HAV IgM. These cases were reported from the areas getting water supply from Ashwani Khud water supply system. This water purification system received water from a natural stream in which treated sewage water was let into 4 km upstream the collection point since one year. HAV-RNA present in serum, sewage and water samples showed 100 per cent sequence homology. Phylogenetic analysis based on 5' non coding (5' NC) and nearly complete genome showed the evidence of HAV genotype IIIA in all the samples. Interpretation and conclusion: The aetiological agent of the present outbreak was hepatitis A virus which is emerging in an outbreak form in India, emphasizing a definite need for formulating vaccination / control strategies.

Item Type:Article
Source:Copyright of this article belongs to Indian Council of Medical Research.
Keywords:Genotype; Hepatitis A Virus; Molecular Epidemiology
ID Code:59814
Deposited On:07 Sep 2011 14:42
Last Modified:18 May 2016 10:15

Repository Staff Only: item control page