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Disease surveillance in England and Wales, March 2019

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APHA disease Surveillance report headlines

  • Lymphoma in a dairy cow

  • Campylobacter abortion in ewes

  • Coccidiosis in preweaned piglets

  • Mycoplasma gallisepticum in gamebirds

Current and emerging issues

Recrudescence of vesicular disease due to senecavirus A in pigs in Brazil

The US Swine Health Information Center recently described the re-emergence of vesicular disease associated with senecavirus A (SVA) in pigs in Brazil. The disease was clinically indistinguishable from notifiable vesicular diseases.

In 2014/15, multiple pig herds in Brazil were affected by SVA, as were herds in the USA from July 2015. An information note was produced at the time, and is available at http://apha.defra.gov.uk/documents/surveillance/diseases/seneca-valley-virus.pdf.

In the current re-emergence, lesions, particularly on the feet, appear more severe and are taking longer to fully resolve. Whether these new outbreaks in Brazil reflect a change in the virus, or in herd immunity, is being investigated.

The vesicular manifestation of SVA infection is of concern because the lesions closely resemble those caused by notifiable vesicular diseases, in particular foot-and-mouth disease (FMD). It is important to maintain awareness among pig keepers and veterinarians attending pigs that any vesicular lesions seen must be reported promptly as suspect notifiable disease for investigation (see ‘Contacting the APHA’, p 436). The Pirbright Institute has a diagnostic PCR test for SVA for use on material from lesions; however, this would be permitted only after investigation for notifiable causes of vesicular disease has ruled them out.

About this report

This report is produced each month by the APHA Surveillance Intelligence Unit and the six Species Expert Groups (livestock and wildlife). The international horizon-scanning summaries are produced by the Defra/APHA International Disease Monitoring (IDM) team, notifiable disease reports by the APHA Veterinary Exotic and Notifiable Disease Unit (VENDU), and threat analysis by the cross-agency Veterinary Risk Group (VRG). The report is drawn from scanning surveillance information, data and reports produced by the APHA Veterinary Investigation Centres and non-APHA partner postmortem examination providers contributing to the VIDA database and …

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