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  0
Positive Mosquito Samples
51
186
9
168
139
218
97
95 228 138  68

Statistics provided by Environmental Services.
*Maricopa County Environmental Services Department's PCR testing results, as of May 21, 2019.

St. Louis Encephalitis Statistics


Category
2015 2016  2017  2018  2019*
Positive Mosquito Samples 60 0 160 106 44

Statistics provided by Environmental Services.
* MCESD's PCR testing results, as of May 21, 2019.

Public Health Statistics on Human Cases

For current human case counts of mosquito-borne diseases among Maricopa County residents, please go here.

For West Nile virus (Human Cases) and other Vector-Borne human disease reports, both seasonal and historic,  go here.


  1. Environmental Services Department


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

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

  2. Public Health


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