Answer: paramyxoviruses

AnswerCrossword Clue
paramyxovirusesPARAMYXOVIRUS, any of a group of viruses which includes the mumps and measles viruses
paramyxovirusesAny of a group of RNA viruses similar to the myxoviruses but larger and hemolytic, including those causing mumps, measles, distemper, rinderpest, and various respiratory infections (parainfluenza)