Here's why:
* Incubation period: The incubation period for strangles (caused by Streptococcus equi equi) is typically 5-14 days. This means the horse can carry the bacteria and be contagious for a period of time before showing any symptoms.
* Carrier state: Even after recovering from strangles, a horse can become a carrier, meaning they still harbor the bacteria in their body and can potentially spread it to other horses.
* Subclinical infections: Some horses may experience a mild, subclinical form of strangles where they only show mild or no symptoms. These horses can still be contagious.
Important note: This is why strict biosecurity measures are crucial in preventing the spread of strangles.
Key biosecurity practices include:
* Isolation of new horses: Quarantining new horses for at least 30 days before introducing them to the main herd.
* Regular health checks: Monitoring horses for signs of strangles.
* Disinfection: Thoroughly cleaning and disinfecting equipment, stalls, and other areas.
* Vaccination: Vaccinating horses can help reduce the severity of strangles and may also help to prevent infection.
If you suspect a horse may be contagious with strangles, it's important to contact a veterinarian immediately. They can assess the horse, recommend appropriate treatment, and help you to prevent further spread of the disease.