Two new simian viruses were recovered from squirrel monkeys and galagos. They possess foamy virus group properties which appear distinct from other virus groups. Serologically they were designated types 4 and 5 and are completely specific from each other and from types 1, 2, 3, 6, and 7 by neutralization tests. The study includes a comparison of the properties of all seven types in one laboratory.
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Paul Johnston (1971) studied this question.
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