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Culex tarsalis, Culex stigmatosoma and Culex quinquefasciatus were susceptible to infection with and capable of transmitting to canaries local strains of Plasmodium relictum.
Culex tarsalis and Culex stigmatosoma were more easily infected with these strains than was Culex quinquefasciatus. This observation affords an explanation for the difference in natural infection rates observed in other studies.
1 From the George Williams Hooper Foundation for Medical Research and the School of Public Health, University of California, San Francisco and Berkeley, California.
2 This investigation was supported in part by a research grant (E31 C5S) from the National Microbiological Institute of the National Institutes of Health, Public Health Service, and in part by a grant from the California Department of Fish and Game. We are indebted to Dr. C. M. Herman, U. S. Fish and Wildlife Service (formerly with the California Department of Fish and Game) for parasite identifications.
3 Present address: Laboratory of Tropical Diseases, National Institutes of Health, Bethesda, Maryland.
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