Abstract
Attempts were made to determine the numbers of viable Plasmodium berghei sporozoites injected by Anopheles stephensi mosquitoes feeding on rodent hosts. Assessment of the numbers injected was made by counting the numbers of exoerythrocytic forms produced by known numbers of infected mosquitoes. The results showed the numbers of viable sporozoites injected to be quite small, on the order of about 1% of the total number of sporozoites in the salivary glands. Mosquitoes with larger numbers of sporozoites in their salivary glands injected more sporozoites. Thus, heavily infected mosquitoes may be more effective vectors. The relative numbers of sporozoites injected by the mosquitoes varied with the host being fed upon. Because of this, it is speculated that host skin factors may be an important determinant of the number of infective sporozoites able to reach the blood after being deposited in the skin.
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