Epidemiology of African horsesickness: duration of viraemia in zebra (Equus burchelli).

The study investigated the African horsesickness virus in zebras, finding it stayed in their system longer than it did in horses. This provided important insights for potential introductions of zebras into horsesickness-free regions.

Study Focus and Methodology

• The research focused on understanding the duration of the African horsesickness virus in zebras as compared to horses. Particularly, the research wanted to establish how long the virus could survive in the blood and spleen of the infected zebras.
• The researchers used an experimental approach to infect the zebras with the African horsesickness virus. They then monitored the zebras over a period, regularly taking samples of the blood and spleen tissue to test for the presence of the virus.

Research Findings

• The findings suggested that the African horsesickness virus persisted for a significantly longer duration in zebras than in horses. The virus was still present in the zebras’ blood even 40 days post infection.
• Further, the virus was isolable from the zebras’ spleen 48 days after infection, implying that the spleen could act as a repository for the virus over a prolonged period.

Implication of the Study

• The results imply that zebras could be a potential long-term carrier of the African horsesickness virus. Since they can harbor the virus for longer durations, they could potentially aid in the spread of the virus into horsesickness-free regions.
• The study thus advises careful consideration of introducing zebras into regions free of African horsesickness. In particular, the research suggests that the introduction of zebras should be restricted to those that are serologically confirmed to be negative for the virus.