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The original item was published from 10/17/2023 9:16:40 AM to 10/31/2023 12:00:03 AM.

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Public Health

Posted on: October 17, 2023

[ARCHIVED] Final MDPH Arbovirus Report of 2023


MDPH concluded the mosquito testing season with 164 WNV positive mosquito samples from Barnstable, Berkshire,

Bristol, Essex, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, Suffolk, and Worcester Counties. MDPH also

reports 28 EEE positive mosquito samples from Barnstable, Bristol, Hampden and Worcester Counties.

Average daytime temperatures will continue to support populations of mosquito vectors which pose a risk for human

transmission until a statewide hard frost. Avoid mosquito bites by using EPA approved repellents, appropriate

clothing and avoiding peak mosquito activity between dusk and dawn. Remove standing water by emptying

containers and tarps.

Check your risk levels throughout the season by visiting our interactive site

details/Massachusetts-arbovirus-update and review the 2023 MDPH Surveillance and Response Plan for updates to

risk levels and risk messaging.

WNV and EEE Virus Surveillance Summary 

Results contained in this report reflect data up to and inclusive of 

MMWR Week 40 (Sunday, 10/08/2023-Saturday, 10/14/2023)

Mosquito Surveillance

 Number of Mosquito Samples Tested 


Number of WNV Positive Samples 


Number of EEE Positive Samples 


Equine/Mammal Surveillance

Number of Mammal Specimens Tested 


Number of WNV Positive Horses 


Number of EEE Positive Horses 


Number of other WNV Positive Mammals 


Human Surveillance

Number of Human Specimens Tested 


Number of Human WNV Cases 


Number of Human EEE Cases 


Additional Info...
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