Publications

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spatial variation in host feeding patterns of culex tarsalis and the culex pipiens complex (diptera: culicidae) in california.west nile virus (family flaviviridae, genus flavivirus, wnv) is now endemic in california across a variety of ecological regions that support a wide diversity of potential avian and mammalian host species. because different avian hosts have varying competence for wnv, determining the blood-feeding patterns of culex (diptera: culicidae) vectors is a key component in understanding the maintenance and amplification of the virus as well as tangential transmission to humans and horses. we investigate ...022897051
spatially explicit west nile virus risk modeling in santa clara county, california.a geographic information system model designed to identify regions at risk for west nile virus (wnv) transmission was calibrated and tested with data collected in santa clara county, california. american crows that died from wnv infection in 2005 provided spatial and temporal ground truth. when the model was run with parameters based on culex tarsalis infected with the ny99 genotype of the virus, it underestimated wnv occurrence in santa clara co. the parameters were calibrated to fit the field ...200919514810
role of corvids in epidemiology of west nile virus in southern california.the invasion of different southern california landscapes by west nile virus (wnv) and its subsequent amplification to epidemic levels during 2004 enabled us to study the impact of differing corvid populations in three biomes: the hot colorado desert with few corvids (coachella valley), the southern san joaquin valley (kern county) with large western scrub-jay but small american crow populations, and the cool maritime coast (los angeles) with a large clustered american crow population. similar su ...200616619622
overwintering of west nile virus in southern california.west nile virus (family flaviviridae, genus flavivirus, wnv) invaded southern california during 2003, successfully overwintered, amplified to epidemic levels, and then dispersed to every county in the state. although surveillance programs successfully tracked and measured these events, mechanisms that allowed the efficient overwintering and subsequent amplification of wnv have not been elucidated. our current research provided evidence for three mechanisms whereby wnv may have persisted in south ...200616619621
host-selection patterns of culex tarsalis (diptera: culicidae) determine the spatial heterogeneity of west nile virus enzootic activity in northern california.the spatial heterogeneity of west nile virus (wnv) activity in sutter county, ca, as measured by mosquito infection rates, was associated with spatial variation in the prevalence of culex blood feeding on competent passeriform hosts. overall, 42 vertebrate host species (31 avian, 11 mammal) were identified from 601 blood-fed culex tarsalis coquillett and 151 blood-fed culex pipiens l. complex females using sequences of the cytochrome c oxidase i gene and the barcode of life data systems database ...201324843936
host (avian) biting preference of southern california culex mosquitoes (diptera: culicidae).the host preference of a vector mosquito species plays a significant role in determining human and animal risk of infection with mosquito-transmitted pathogens. host preferences of common southern california culex species for four bird species, american crow (corvus brachyrhynchos), house sparrow (passer domesticus), house finch (carpodacus mexicanus), and mourning dove (zenaida macroura), were examined by determining the proportion of each mosquito species that successfully engorged on each of ...201222679878
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