? Equine influenza, is vaccination really necessary?

 does not contain the current circulating strain, it may provide some degree of reduction of clinical signs; but this is not guaranteed. An outbreak of Equine Influenza in the UK in 2019 highlighted the need for greater numbers of horses to be vaccinated to achieve herd immunity. And also prompted changes in the recommended interval between vaccination in high-risk animals. 

In this outbreak, even vaccinated horses suffered from clinical signs. Albeit generally with less severity and shorter duration than those of their unvaccinated cohorts. But, the outbreak was of sufficient severity to necessitate a shutdown of racing for six days, and the animal welfare and the economic implications of an outbreak can be severe. 

How often to vaccinate?

Following the 2019 outbreak, veterinary surgeons now often recommend a booster vaccination every six months to ensure greater immunity levels.

However, the vaccination schedules, or timing of each vaccination in the course, vary depending on the governing body of the individual discipline. One point worth noting is that some guidelines are not consistent with those of the manufacturer, which may lead to lower rates of immunity. If you are concerned, it is always advisable to discuss the vaccination schedule and timings with your vet. They will be able to advise on the best approach taking your circumstances into account. 

So should I vaccinate my horse?

There is no government legislation that requires horses to be vaccinated, so this decision tends to be down to you, based on your circumstances. However, if a horse is competing, they must be vaccinated to comply with specific regulations. This can also include specific venues such as racecourses who will only allow vaccinated animals onto the premises; even if not competing. These rules will vary depending on the regulatory body. If in doubt, please consult your veterinary surgeon or the specific authority. Guidelines do change occasionally. So it is the owner’s responsibility to keep up to date with any changes as otherwise they risk being turned away from competition. Many yard owners will also insist that horses are vaccinated based on the manufacturer’s guidelines so that all animals on the yard are as protected as possible. 

When surveyed, most owners who were reluctant to vaccinate were so because of concerns about unnecessary vaccination, adverse reactions, lack of efficacy or the cost.