Abstract
Two different doses of Ross River virus (RR) were fed to Ochlerotatus vigilax (Skuse), the primary coastal vector in Australia; and blood engorged females were held at different temperatures up to 35 d. After ingesting 10(4.3) CCID50/mosquito, mosquitoes reared at 18 and 25 degrees C (and held at the same temperature) had higher body remnant and head and salivary gland titers than those held at 32 degrees C. although infection rates were comparable. At 18, 25, and 32 degrees C, respectively, virus was first detected in the salivary glands on days 3, 2, and 3. Based on a previously demonstrated 98.7% concordance between salivary gland infection and transmission, the extrinsic incubation periods were estimated as 5, 4, and 3 d, respectively, for these three temperatures. When Oc. vigilax reared at 18, 25, or 32 degrees C were fed a lower dosage of 10(3.3) CCID50 RR/mosquito, and assayed after 7 d extrinsic incubation at these (or combinations of these) temperatures, infection rates and titers were similar. However, by 14 d, infection rates and titers of those reared and held at 18 and 32 degrees C were significantly higher and lower, respectively. However, this process was reversible when the moderate 25 degrees C was involved, a...Continue Reading
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