Nairobi Sheep Disease is a viral infection that primarily affects sheep, particularly in East Africa. It is caused by the Nairobi sheep disease virus, which is transmitted by ticks. The disease can lead to symptoms such as fever, swelling, and a decrease in wool production, ultimately affecting the health and productivity of the sheep. The disease is of significant concern for livestock farmers, as it can result in high mortality rates in infected flocks. Control measures include managing tick populations and vaccination, which can help protect sheep from this disease and improve overall herd health.