Malaria is not endemic to California. But on occasion, imported malaria resulted in local outbreaks. The map below illustrates those transmissions where 10 or more cases resulted.

• Autochthonous malaria:

  --- Indigenous. Mosquitoborne transmission of malaria in a geographic area where malaria occurs regularly.
  --- Introduced. Mosquitoborne transmission of malaria from an imported case in an area where malaria does not occur regularly.

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Malaria is no longer endemic in California. However, the disease is diagnosed in California residents every year, primarily as a result of contracting the disease in malarious areas outside the USA, and rarely, because of small focal outbreaks occurring as a result of importation of a case into an area when and where anopheline mosquitoes are prevalent.