Opinion: Namibia’s FMD missing viral jigsaw

The local outbreak of foot-and-mouth disease in Namibia remains not only an emergency but a viral jigsaw.

Current reports of the SAT1 serotype identify another piece but don’t really complete the puzzle.

The virus itself is a very small, non-enveloped RNA virus belonging to the genus Aphthovirus. The outer shell, known as the capsid, is the main target for these neutralising antibodies and contains the genome. The virus has a central challenge. Its polymerase lacks proofreading and is error prone.

This means copying errors can change the genome and create difficulty for vaccine protection. A few mutations alter capsid sites recognised by antibodies; many do not. This is not to say that genetic change automatically means vaccine escape.

The term “FMD” is a general board term. We need to remember that the FMD virus comprises seven recognised serotypes, with no reliable cross-protection between them. The name SAT 1 belongs to the SAT serotypes historically associated with sub-Saharan Africa.

We also know that African buffalo remain a natural reservoir for this virus. These genetic groupings help reconstruct the virus’s relationships and connect them to geographical history.

The distinction between a broad serotype label and the virus’s finer identity matters. This is especially true when the country is trying to find answers to transmission chains.

Even if labelled SAT 1, that doesn’t mean two outbreaks are caused by the same virus strain. In simpler terms, it helps us know the individual. It does not tell us finer details like their fingerprints.

These genetic puzzle pieces are needed to sequence the virus lineage and help connect or distinguish outbreaks.

Regional outbreaks have occurred across the border in our neighbouring countries. The FMD SAT1 serotype has circulated explosively across SADC in 2026. Namibia’s southern zone was indeed an anomaly in maintaining its disease-free status for so long. The exposure one thus asks was a foreseeable risk. Earlier in the year, awareness and readiness were created to brace for the viral storm. However, was the “only a matter of time” approach an explanation or a challenge to our preparedness?

The current focus on restrictions, new fencing zones, and efforts is commendable, but do they really help solve the puzzle? Yes, transmission is interrupted and essential time is bought; however, they ultimately address different questions. We currently focus only on where the virus is going, but we should also ask which viruses we are confronting. This is the essential difference and why viral sequencing is important.

Vaccine matching then answers which vaccines are available and whether this vaccine can offer adequate protection. This empowers not only veterinarians but also those directly affected, namely the farmers. To know is to measure, according to farmers, so why stop only at cattle genetics and apply that same logic to viruses threatening herds?

FMD is not considered a public health risk. This is one of the most frequently asked questions by the public. Who among us would knowingly eat meat from a visibly sick animal? Many people would hesitate. That intuitive hesitation does not prove the risk of human infection.

It simply shows why public reassurance must distinguish between human health, animal health, and food-chain acceptability. This is also exactly where the FMD virus interlinks and sits at the table.

Namibia needs to prepare its biosecurity for a new age. As pathogens are constantly evolving and the world becomes more connected, so too must our preparedness. Understanding these threats is the basis of our wellbeing and, we would argue, our sovereignty.

****Dr Berit Platt is a Virology Registrar in the Department of Medical Virology at Stellenbosch University’s Faculty of Medicine and Health Sciences. ***

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