Serological study of foot and mouth disease virus type A in India

Belwal, L M; Palanisamy, Raji; Nagaiah, K.; Kalanidhi, A P; Jagannatha, H M; Ramanna, B. C.; Srinivasan, V.A.

doi:10.20506/rst.5.3.264

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…Extensive studies on the genetic and antigenic variation of FMDV serotypes O and Asia-1 have been carried out worldwide. Unlike serotype O and Asia-1 virus, serotype A isolates have shown extensive antigenic variation (Arrowsmith 1975;Belwal et al 1986;Belwal et al 1987;Armstrong et al 1994;Azad et al 1995;Araujo et al 2002). Several workers (Tosh et al 2004;Mittal et al 2005;Jangra et al 2005;Mohapatra et al 2008) have studied genetic and antigenic variation in Indian FMDV isolates.…”

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confidence: 99%

Genetic analysis of foot-and-mouth disease virus serotype A of Indian origin and detection of positive selection and recombination in leader protease- and capsid-coding regions

et al. 2009

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The leader protease (L pro) and capsid-coding sequences (P1) constitute approximately 3 kb of the foot-and-mouth disease virus (FMDV). We studied the phylogenetic relationship of 46 FMDV serotype A isolates of Indian origin collected during the period 1968-2005 and also eight vaccine strains using the neighbour-joining tree and Bayesian tree methods. The viruses were categorized under three major groups -Asian, Euro-South American and European. The Indian isolates formed a distinct genetic group among the Asian isolates. The Indian isolates were further classi?ed into different genetic subgroups (<5% divergence).Post-1995 isolates were divided into two subgroups while a few isolates which originated in the year 2005 from Andhra Pradesh formed a separate group. These isolates were closely related to the isolates of the 1970s. The FMDV isolates seem to undergo reverse mutation or convergent evolution wherein sequences identical to the ancestors are present in the isolates in circulation. The eight vaccine strains included in the study were not related to each other and belonged to different genetic groups. Recombination was detected in the L pro region in one isolate (A IND 20/82) and in the VP1 coding 1D region in another isolate (A RAJ 21/96). Positive selection was identi?ed at aa positions 23 in the L pro (P < 0.05; 0.046*) and at aa 171 in the capsid protein VP1 (P < 0.01; 0.003**).

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