Abstract
Summary
Fly parasites of the genus Philornis (Anthomyidae) attacking nestling birds have been shown capable of becoming infected with St. Louis and Ilhéus viruses. In one instance, a larva was found positive for St. Louis virus after feeding on a nestling ani that was circulating this virus. In a second case, 2 of 9 adult flies became infected with Ilhéus virus after they had been inoculated as larvae 10 and 11 days previously. Similarly, 6 of 8 adult flies proved positive for St. Louis virus after being inoculated 10 days previously as larvae.
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