Which of the following diseases is considered reportable under the Health of Animals Act?

Brucellosis is categorized as a reportable disease under the Health of Animals Act due to its significant public health implications and its potential impact on livestock. This bacterial infection primarily affects cattle, but it can also infect dogs and cause serious health issues. The reportability ensures that health authorities can monitor and control outbreaks, preventing transmission to other animals and humans, thereby protecting both animal and public health.

The other diseases listed, while they are significant in veterinary medicine, do not have the same reportable status under the Health of Animals Act. Distemper and Feline Leukemia, for example, are viral infections that primarily affect companion animals (dogs and cats respectively) and are not typically associated with public health concerns. Heartworm is a parasitic disease primarily affecting dogs and is important for animal health, but it is not classified as reportable under the same legislative framework.