the Effect of Repeated Blood Meals Infective for Bluetongue on the Infection Rate of Culicoides Variipennis

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Abstract
Repeated infective feedings of blood meals containing a uniform concentration of bluetongue virus progressively increased the infection rate when the virus concentration was well below that needed to infect 100% of the susceptible flies in a colony population of Culicoides variipennis (Coquillett). The blood meal having the 10−1 dilution of virus (3 × 106 egg median lethal doses/ml) infected about 30% of the flies regardless of the number of infective meals given; thus this 30% is the susceptibility rate for our colony population of C. variipennis (SONORA strain) to the strain of bluetongue virus designated as 62-45S. No flies were infected at the 10−4 dilution. A normal blood meal prior to an infective meal at 10−1 dilution did not make the population become more or less susceptible. A reduction in the infection rate after the fourth infective meal indicated a loss of bluetongue virus infection, and possibly of susceptibility, by physiologically older flies.

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