Descriptive epidemiology of African horse sickness in Zimbabwe.

This research explores the occurrence of African horse sickness in Zimbabwe, and suggests that younger and unvaccinated horses are at a greater risk of contracting the disease, especially during the late rainy season.

Study Overview

• This study was aimed to determine the prevalence of African horse sickness, a deadly viral disease, in horses within Zimbabwe. The research used existing records from two private equine clinics in Harare. The timeline investigated was from 1998 to 2004.

Seasonal Impact on Disease Prevalence

• The research highlighted a seasonal aspect to the disease prevalence. During the late rainy season (March to May), the disease was found to be more common. This may be connected to a greater prevalence of the insect vectors known to transmit this viral disease.

Influence of Age and Vaccination

• The age of horses was identified as a major risk factor in contracting the disease. Younger horses, particularly foals and yearlings (horses between one and two years of age), were found to be about 1.80 times more likely to contract the disease than older horses.
• In terms of case fatality rates, meaning the proportion of cases that resulted in death, it was seen to be higher in foals and yearlings. However, the statistical significance of this finding was not elaborated in the abstract.
• Another important element was the vaccination status of the horses. Those horses that had been vaccinated were 0.12 times less likely to die from the disease when compared to unvaccinated horses. This highlights the effectiveness of vaccination in preventing fatality due to the African horse sickness.

Recommendations

• Given the significant impact of vaccination status, the study emphasised the importance of ensuring horses are adequately protected against African horse sickness through vaccination. It also points out the need for having an effective vaccination strategy in Zimbabwe, especially for the younger and more vulnerable horses.

Conclusion

• This study is an important reference for understanding the epidemiology and risk factors associated with African horse sickness in Zimbabwe. It provides insights on how seasonality, age and vaccination play pivotal roles in disease prevalence. More robust strategies are needed to vaccinate horses efficiently, particularly for the younger and susceptible population in order to curb this devastating disease.