West Nile Virus SurveillanceThe District’s West Nile virus surveillance program reports several types of positive West Nile virus results, including dead birds, mosquito samples (“pools”), sentinel chickens, and human cases.
2023 Service RequestsWhile total service requests this July were slightly below the five-year average for the month (480 requests compared to an average of 504), the total was well above average in August (797 requests compared to an average of 606). This shift was largely due to a delayed surge in yellowjacket requests, more than doubling in number between July and August, following a very quiet June for these type…
2023 Mosquito SurveillanceIn August, the adult mosquito species that was most frequently collected in traps was Culex pipiens, averaging 9.742 per trap. This mosquito is present year-round, but peaks in abundance during late summer, as the warmer temperatures speed up its life cycle. Culex pipiens numbers are near average for this time of year. Culex erythrothorax, a mosquito that breeds among tules (cattails) in ponds and…
Tick SurveillanceThe District collects ticks from around the County and tests for several tick-borne diseases, including Borrelia burgdorferi (which can cause Lyme disease), Anaplasma phagocytophilum (which can cause anaplasmosis), and Borrelia miyamotoi (which can cause a type of tick-borne relapsing fever).
