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Excretion of foot-and-mouth disease virus in oesophageal-pharyngeal fluid and milk of cattle after intranasal infection

Published online by Cambridge University Press:  15 May 2009

P. W. de Leeuw ,
J. G. van Bekkum  and
J. W. A. Tiessink
P. W. de Leeuw
Affiliation:
Central Veterinary Institute, Virology Department, 39 Houtribweg, Lelystad, The Netherlands
J. G. van Bekkum
Affiliation:
Central Veterinary Institute, Virology Department, 39 Houtribweg, Lelystad, The Netherlands
J. W. A. Tiessink
Affiliation:
Central Veterinary Institute, Virology Department, 39 Houtribweg, Lelystad, The Netherlands
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The virus growth in the pharyngeal area and the virus excretion in milk of susceptible and vaccinated dairy cows after intranasal instillation of foot-and-mouth disease (FMD) virus type O1 were examined. Ten vaccinated cows were purchased through a market. Of these, nine had delivered their first calf. The cows were inoculated 2–9 months after having received the last dose of vaccine. All vaccinated cows resisted the intranasal challenge. The virus multiplied in the pharyngeal area but, compared with two susceptible controls, to a limited extent. No clear relation was found between virus growth and the titre of circulating neutralizing antibody at the time of challenge.

Virus was first detected in milk samples of the susceptible cows when generalized FMD lesions had developed on day four; the excretion lasted for 3–4 days.

Up to 19 days after inoculation untreated milk of the vaccinated cows was examined for the presence of infectious FMD virus. Samples were inoculated onto cell cultures, fed to susceptible pigs and calves and injected intramuscularly and/or intradermolingually into susceptible steers. No infectious FMD virus could be detected, either in cell cultures or in susceptible animals. The animals did not develop neutralizing antibody against FMD virus and were subsequently shown to be fully susceptible to challenge. The results are discussed with particular reference to current problems regarding the export of milk products from countries where vaccination against FMD is practised to countries free of the disease.

Type
Research Article
Information
Journal of Hygiene , Volume 81 , Issue 3 , December 1978 , pp. 415 - 426
Copyright
Copyright © Cambridge University Press 1978

References

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