Distemper in a shelter: transmission, isolation and disinfection
Distemper is confirmed in a rescue shelter in a puppy that arrived 10 days ago with oculonasal discharge. It shares a building with 15 other dogs of variable vaccination status. The manager asks what to do.
Which statement is correct?
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A. The virus survives for months in the environment like parvovirus, so the priority is disinfecting with bleach for weeks
Distemper virus is enveloped and labile outside the host: it survives hours at room temperature (somewhat longer in the cold) and common disinfectants inactivate it. Cleaning is needed, but it is not the priority.
B. It is spread mainly by aerosols and direct contact; sick dogs must be isolated and contacts vaccinated as soon as possible with a modified-live vaccine
Correct. Spread is via respiratory secretions and close contact. Dogs shed virus from a few days before signs appear and for weeks or months afterwards. Modified-live vaccine induces very rapid protection in dogs without maternal antibodies.
C. Dogs are only contagious while febrile; once respiratory signs resolve they can return to the shared building
Shedding starts before signs and may continue for weeks or months after apparent recovery (up to around 3 months has been described), so improvement alone is not enough.
D. Transmission is faecal-oral, so removing faeces and separating food bowls is enough
Although the virus is shed in several secretions, the main route is respiratory (droplets and aerosols). Focusing only on faeces leaves the most important route uncontrolled.
lightbulb Key takeaway
In distemper, control relies on isolating sick dogs, vaccinating every dog on intake (with modified-live vaccine from 4–6 weeks of age in shelters) and not mixing animals of unknown status. Remember the wildlife reservoirs (foxes, wolves, mustelids): the virus still circulates in Spain and unvaccinated dogs remain at risk.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.