A large Babesi a sp., isolated from a sheep in Iran, proved to be serologically and morphologically different from B. motasi and B. ovis. The parasite, designated B. crassa n. sp., is characterized by the frequent occurrence of four organisms in one erythtocyte, which is the result of quadruple division and, in other cases, of two successive binary divisions. Parasites resulting from the first of two successive binary divisions are exceptionally broad. B. crassa appears to be of low

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... y for sheep and goats, to which it is also infect ive. The vector is unknown.