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Background  Mosquito lifespan can influence the circulation of disease causing pathogens because it affects the time available for infection and transmission. The life-cycle of mosquitoes is determined by intrinsic and environmental factors, which can include the availability of hosts and suitable resting environments that shelter mosquitoes from extreme temperature and desiccating conditions. This study determined the parity rates (an indirect measure of survival) and plant resting preference of vectors of Rift Valley fever (RVF) in northeastern Kenya.    Methods  Resting mosquitoes were trapped during the rainy and the dry season using a Prokopack aspirator from vegetation, whereas general adult populations were trapped using CDC light traps. At each site, sampling was conducted within a 1 km 2  area, subdivided into 500 × 500 m quadrants and four 250 × 250 m sub-quadrants from which two were randomly selected as sampling units. In each sampling unit, plants were randomly selected for aspiration of mosquitoes. Only  Aedes mcintoshi  and  Ae. ochraceus  were dissected to determine parity rates while all mosquito species were used to assess plant resting preference.    Results  Overall, 1124 (79 %, 95 % CI = 76.8–81.1 %) mosquitoes were parous. There was no significant difference in the number of parous  Ae. mcintoshi  and  Ae. ochraceus . Parity was higher in the rainy season than in the dry season. Daily survival rate was estimated to be 0.93 and 0.92 among  Ae. ochraceus  and  Ae. mcintoshi , respectively.  Duosperma kilimandscharicum  was the most preferred plant species with the highest average capture of primary (3.64) and secondary (5.83) vectors per plant, while  Gisekia africana  was least preferred.    Conclusion  Survival rate of each of the two primary vectors of RVF reported in this study may provide an indication that these mosquitoes can potentially play important roles in the circulation of diseases in northern Kenya. Resting preference of the mosquitoes in vegetation may influence their physiology and enhance longevity. Thus, areas with such vegetation may be associated with an increased risk of transmission of arboviruses to livestock and humans.

Plant resting site preferences and parity rates among the vectors of Rift Valley Fever in northeastern Kenya