Canine distemper virus threatens Sumatran tigers, a species found only on the Indonesian island of Sumatra, according to veterinarian John Lewis of Wildlife Vets International. Tigers in other regions have already been affected by the virus, said Dr. Lewis. Once primarily a canine pathogen, canine distemper virus "has evolved and has changed its pattern of animals it can infect to include marine mammals (such as seals) and big cats," said Dr. Lewis, who is working with other veterinarians to develop a plan to stem the disease's spread.

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