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Namibia Detects a New Strain of Foot-and-Mouth Disease

Namibia has detected a new strain of foot-and-mouth disease (FMD) in the country that has infected thousands of cattle, the agriculture minister said in a statement on Thursday.

The viral disease, which causes lesions and lameness in cattle, sheep and other cloven-hoofed animals but does not affect people, was first detected in May in the Zambezi region bordering neighbour Zambia.

But, despite high vaccinations in the affected herds, worried officials noted that infection rates remained high and decided to investigate further.

"It is important to highlight that the new FMD serotype O also causes clinical cases in goats and sheep and they can spread the disease further to other susceptible animals," Minister Carl Schlettwein said in a statement.

The minister said the new strain was detected in early August for the first time in the southern African nation, adding that investigations found it was introduced into the country from Zambia through the illegal cross-border movement of livestock.

Schlettwein warned that meat exports from Namibia, which is allowed to export beef to China, EU, and United States could be affected by the latest outbreak.

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Leman Swine Conference: Vaccination strategies to reduce PRRS virus recombination

Video: Leman Swine Conference: Vaccination strategies to reduce PRRS virus recombination

Dr. Jay Calvert, Research Director with Zoetis, recently spoke to The Pig Site’s Sarah Mikesell at the 2023 Leman Swine Conference in St. Paul, Minnesota, USA, about his conference presentation on porcine reproductive and respiratory syndrome (PRRS) virus recombination.

“The number one problem in PRRS these days from a vaccine point of view is the emergence of new strains of PRRS. Since the beginning, we have had new strains and a lot of diversity,” said Dr. Jay Calvert. “We thought we knew it was all about mutation changes in amino acids and the individual strains over time, but they take on new characteristics.”

With the onset of more common whole genome sequencing and recombination analysis, Dr. Calvert says there is another mechanism, and recombination seems to be a key factor.