Within our District Boundaries

  • West Nile virus
  • Western Equine Encephalomyelitis virus
  • St. Louis Encephalitis virus
    • Infection with Saint Louis Encephalitis virus rarely results in severe symptoms. It is closely related to West Nile virus and distinguishing between the viruses requires advanced diagnostic tests.Infected mosquitoes pass the virus to birds when they take a blood meal.Mosquitoes can transmit St. Louis encephalitis virus to humans too. Few infected people develop symptoms, but serious disease can occur.  The health risk is higher for elderly and immune compromised persons. Saint Louis Encephalitis was last detected in mosquito samples within the District in 1993, but is currently re-emerging in various areas of California.
  • Malaria
    • Historically, Malaria was local to the Durham Mosquito Abatement District, causing the initiation of organized mosquito control here. However, Malaria was eradicated in California in the 1950’s as part of a coordinated nationwide governmental public health project. It is vectored by Anopheles spp. Mosquitoes from an infected human to a new susceptible human host. There are several plasmodia (single celled parasites) responsible for the illness, and the severity of the disease can be in­fluenced by the infective plasmodium.
  • Canine Heartworm
  • Lyme Disease