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Measles is a highly contagious respiratory infection caused by the morbillivirus .
The cause was also reported to be a morbillivirus , but the infection may have spread so widely because the animals' immune systems were compromised by pollutants.
Morbillivirus infections which were not documented in aquatic mammals until 1988,
Morbillivirus is a type of virus that causes serious disease in several species of animals and in people.