Town of Williamsburg, Massachusetts
141 Main St., P.O. Box 447, Haydenville, MA 01039-0447
ph: (413) 268-8400
fx: (413) 268-8409
West Nile Virus & EEE Messages-Arbovirus Surveillace Program Report

- Massachusetts Department of Public Health

 Arbovirus Surveillance Program Report

 Report Date: August 19, 2013

 Key Public Risk Communication Messages for This Week:

 The weather this week is forecast to be much warmer and more humid than last week, conditions which are generally favorable for mosquitoes and the viruses they carry. This is likely to generally increase risk of mosquito-borne illness. As early season sports activities begin, remind residents that mosquitoes are attracted to both body heat and carbon dioxide and both are produced in higher amounts during physical activity. Encourage participants to use mosquito repellent to help reduce their exposure to mosquito bites.


West Nile Virus

 People, especially those over 50 and/or immuno compromised, should be strongly encouraged to use repellent and cover up to reduce mosquito bites.

 WNV infected mosquitoes have been found in Barnstable, Berkshire, Bristol, Dukes, Essex, Hampshire, Middlesex, Norfolk, Plymouth, Suffolk and Worcester counties. These geographically widespread findings indicate that virus is circulating throughout the Commonwealth and is not confined to municipalities where infected mosquitoes have been found. Residents are also encouraged to practice source reduction:


Drain buckets, barrels, tarps, and wheel barrows to avoid water accumulation


Change the water twice each week in birdbaths and outdoor pet water dishes


Keep rain gutters clean of debris


Check children's outdoor toys for water accumulation


Eastern Equine Encephalitis

 The identification of EEE infected mammal-biting mosquitoes in Amherst and the deaths of two horses in Belchertown from EEE indicate that area as having an elevated risk from EEE. There have also been scattered findings of EEE in mosquitoes from southeastern Massachusetts.

 Residents in ALL areas that have seen EEE activity over the last several years should be encouraged to practice good personal preventive behaviors to avoid mosquito bites. These areas include parts of Essex county, all of Bristol and Plymouth counties, the area around Orange and Athol, the area around Belchertown and Amherst, and Pittsfield. 2


WNV and EEE Virus Surveillance Summary

 Results contained in this report reflect data inclusive of

 MMWR Week 33 (Sunday, 8/11/2013 – Saturday, 8/17/2013)

Mosquito Surveillance

Number of Mosquito Pools Tested


Number of WNV Positive Pools


Number of EEE Positive Pools


Equine/Mammal Surveillance

Number of Mammal Specimens Tested


Number of WNV Positive Horses


Number of EEE Positive Horses


Number of other EEE Positive Mammals


Human Surveillance

Number of Human Specimens Tested


Number of Human WNV Cases


Number of Human EEE Cases










Charles Kaniecki, District Health Officer

Mass. Dept.of Public Health

Western Regional Office

23 Service Ctr Rd.

Northampton, MA. 01060

(413) 586 7525 x 3167

(413) 784 1037 fax

(617) 839 3237 cell

 Bureau Enviromental Health 617 624