Mosquito-Borne Disease Surveillance

West Nile Virus Statistics


Category
2009 2010 2011 2012 2013 2014 2015 2016 2017       2018  2019*
 
Positive Dead Birds 1 0 0 2 0 0 0 0  0  1  0
Positive Horses 0 0 3 0 0 3 1 0  0  2  1
Positive Mosquito Samples
51
186
9
168
139
218
97
95 228 138 416

Statistics provided by Environmental Services.
*Maricopa County Environmental Services Department's PCR testing results, as of October 14, 2019.

St. Louis Encephalitis Statistics


Category
2015 2016  2017  2018  2019*
Positive Mosquito Samples 60 0 160 106 208

Statistics provided by Environmental Services.
* MCESD's PCR testing results, as of October 14, 2019.

Public Health Statistics on Human Cases

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

  1. Environmental Services Department


    Physical Address
    501 N. 44th Street
    Suite # 200
    Phoenix, AZ 85008

    Fax: 602-506-5141

  1. Public Health


    Fax: 602-506-6885