Mosquito-Borne Disease Surveillance

West Nile Virus Statistics


Category
 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
 		 2020
 		 2021*
 
Positive Dead Birds 1 0 0 2 0 0 0 0  0  1  0  0  0
Positive Horses 0 0 3 0 0 3 1 0  0  2  1  1  0
Positive Mosquito Samples
 51
 186
9
 168
 139
 218
 97
 95 228 138  417  10  18

Statistics provided by Environmental Services.
*Maricopa County Environmental Services Department's PCR testing results, as of June 11, 2021.

St. Louis Encephalitis Statistics


Category
 2015 2016  2017  2018  2019
 		  2020
  2021*
Positive Mosquito Samples 60 0 160 106  213 152  0
               

Statistics provided by Environmental Services.
* MCESD's PCR testing results, as of June 11, 2021.

Public Health Statistics on Human Cases

Find current human case counts and historical case counts of mosquito-borne diseases among Maricopa County residents.

Contact Us

  1. Environmental Services Department

    Physical Address
    301 W Jefferson St
    Phoenix, AZ 85003

    Phone: 602-506-6616
    Fax: 602-506-5141

  1. Public Health

    Contact the Department

    Phone: 602-506-6900
    Fax: 602-506-6885

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