What must be done immediately after an equine tests positive for Equine Infectious Anemia?

When an equine tests positive for Equine Infectious Anemia (EIA), the immediate priority is to prevent the spread of this serious viral disease. Quarantining all exposed equines is essential for controlling the potential outbreak. This step helps to ensure that any other horses that may have come into contact with the infected animal are monitored and do not spread the virus further. Quarantine allows for the observation and testing of the exposed equines to determine their health status, safeguarding both the affected equines and the larger equine community.

Other options may seem like potential responses, but they do not address the immediate need for biosecurity. Selling the equine or transporting it to an auction could contribute to the disease's spread, as the infected animal might transmit EIA to other horses. Re-testing all equines on the premises could be a necessary step later, but it is crucial to first contain the situation with quarantine measures before further actions are taken.