Abstract
I-fective larvae were surgically introduced into the abdomens of previously uninfected mosquitoes to determine whether such larvae could migrate from this site to other parts of the body, particularly to the head and proboscis. Dissection of 27 mosquitoes so inoculated indicated that in 22 specimens the larvae had migrated from the site of injn. Of the total of 68 live larvae recovered, 32 had migrated as far as the thorax and an additional 12 as far as the head or proboscis, 2 larvae reaching the latter site within 5 min. The results indicate that the infective larvae are capable of moving freely from the abdomen to other parts of the body of the mosquito intermediate host and that there is a definite tendency for such migrations to take place. Therefore, infective larvae occurring anywhere in the body of the mosquito must be considered potentially capable of reaching the proboscis and of transmitting infection to a human host.

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