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Isotype-specific antibody responses to foot-and-mouth disease virus in sera and secretions of ‘carrier’ and ‘non-carrier’ cattle

Published online by Cambridge University Press:  15 May 2009

J. S. Salt
Affiliation:
Institute for Animal Health, Pirbright Laboratory, Ash Road, Pirbright, Surrey GU24 ONF, UK
R. P. Kitching
Affiliation:
Institute for Animal Health, Pirbright Laboratory, Ash Road, Pirbright, Surrey GU24 ONF, UK
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Isotype-specific antibody responses to foot-and-mouth disease virus (FMDV) were measured in the sera and upper respiratory tract secretions of vaccinated and susceptible cattle challenged with FMDV by direct contact or by intranasal inoculation. A comparison was made between cattle that eliminated FMDV and those that developed and maintained a persistent infection. Serological and mucosal antibody responses were detected in all animals after challenge. IgA and 1gM were detected before the development of IgG1 and IgG2 responses. 1gM was not detected in vaccinated cattle. Challenge with FMDV elicited a prolonged biphasic secretory antibody response in FMDV ‘carrier’ animals only. The response was detected as FMDVspecific IgA in both mucosal secretions and serum samples, which gained statistical significance (P < 0·05) by 5 weeks after challenge. This observation could represent the basis of a test to differentiate vaccinated and/or recovered convalescent cattle from FMDV ‘carriers’.

Information

Type
Research Article
Copyright
Copyright © Cambridge University Press 1996