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In a series of ten experiments which involved a total of 120 A. quadrimaculatus, 31 or 25.8 per cent were infected with P. cathemerium in the canary. The number of oocysts per stomach varied from 3 to 600, averaging 33. Although the oocysts matured and appeared normal in every respect, sporozoites have not yet been found in the salivary glands of A. quadrimaculatus kept as long as 21 days after the infectious blood meal. Two lots of C. quinquefasciatus fed simultaneously with the Anopheles revealed infection rates of 75 and 93 per cent.
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