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Alternate vaccine strain selection in the wake of emerging foot-and- mouth disease virus serotype A antigenic variants in India.

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Title Alternate vaccine strain selection in the wake of emerging foot-and- mouth disease virus serotype A antigenic variants in India.
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Creator J K Mohapatra
B Das
M Rout
B P Sreenivasa
S Subramaniam
A Sanyal
B Pattnaik
 
Subject FMD virus serotype A
Alternate vaccine strain selection
VNT
 
Description Not Available
‘National foot-and-mouth disease (FMD) control programme’ is being implemented in India and therefore predicting vaccine match is a key surveillance task. Recently, a considerable proportion of field viruses (75.6%) showed antigenic drift from the existing serotype A vaccine strain A IND 40/2000 necessitating search for an alternate strain. Here, antigenic relationship (‘r1’ value) of 87 field viruses with each of the 8 candidate strains was estimated by virus neutralization test. A IND 27/2011 strain emerged to be the one with the widest spectrum of antigenic coverage showing ‘r1’ value of more than 0.3 with 81.6% of field strains. It achieved a reasonably high titre of log10 7.5 TCID50/ml in BHK-21 suspension cell which was accompanied by positive charge gaining substitutions (E82–K and E131–K in VP2) thought to have adaptive significance. However, potency trial remains to be conducted before A IND 27/2011 finds a place in the vaccine formulation.
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Date 2023-05-12T04:17:51Z
2023-05-12T04:17:51Z
2018-05-31
 
Type Article
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/77162
 
Language English
 
Relation Not Available;
 
Publisher Vaccine