Massachusetts Department of Public Health
Arbovirus Surveillance Program Report
Key Public Risk Communication Messages for This Week:
MDPH has identified four EEE human cases in Middlesex, Plymouth, and Worcester Counties, two EEE horse cases in Plymouth County, and 95 EEE positive mosquito samples, from Barnstable, Bristol, Essex, Middlesex, Norfolk, Plymouth, and Worcester Counties. MDPH has also identified 11 WNV human cases from Barnstable,
Bristol, Hampden, Middlesex, Norfolk, and Suffolk Counties, and 317 WNV mosquito samples collected statewide.
Aerial spraying to control EEE mosquito vectors in Plymouth County and ground spraying in Worcester County was completed on 8/31/24. For more information and a list of impacted communities, please visit https://www.mass.gov/info-details/mosquito-control-and-spraying
Completed aerial and ground spray maps are available are posted here: https://massnrc.org/spray-map/Region/List
In response to recent arbovirus detections, risk levels have been elevated in adjacent communities. Personal protection measures are recommended due to elevated arbovirus detections and average mosquito vector populations across the state. Check your risk levels throughout the season by visiting our interactive site https://www.mass.gov/info-details/massachusetts-arbovirus-update
Regional precipitation events and above average daytime weather will continue to support populations of WNV and EEE mosquito vectors. 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. Please review the 2024 MDPH Surveillance and Response Plan for updates to risk levels and risk messaging. https://www.mass.gov/doc/2024-arbovirus-surveillance-and-response-plan/download
WNV and EEE Virus Surveillance Summary Results contained in this report reflect data up to and inclusive of MMWR Week 37 (Sunday, 09/08/2024-Saturday, 09/15/2024) |
Mosquito Surveillance |
Number of Mosquito Samples Tested | 7938 |
Number of WNV Positive Samples | 317 |
Number of EEE Positive Samples | 95 |
Equine/Mammal Surveillance |
Number of Mammal Specimens Tested | 9 |
Number of WNV Positive Horses | 0 |
Number of EEE Positive Horses | 2 |
Number of other WNV Positive Mammals | 0 |
Human Surveillance |
Number of Human Specimens Tested | 171 |
Number of Human WNV Cases | 11 |
Number of Human EEE Cases | 4 |
Berkshire
Bristol
Summary of 2024 Mosquito Samples Tested
MMWR Week:
Cape Cod
Central
Dukes
East
Norfolk
Northeast
Pioneer
Plymouth
Suffolk
Total
County
County
Massachusetts State Public Health Laboratory
(Specimens Tested)
MCP
MCP
MCP
MA MCP
County MCP
Middlesex MCP
Country MCP
MA MCP
Valley
County MCP
SPHL
County MCP
Tested
33 (08/11-08/17/2024) 25 34 58 96 5 23 42 41 43 212 94 17 690 34 (08/18-08/24/2024) 27 32 40 66 6 45 15 88 30 0 91 1 0 450 35 (08/25-08/31/2024) 26 31 42 70 6 33 16 65 35 40 154 22 540 36 (09/01-09/07/2024) 26 37 48 78 4 3 1 33 38 26 38 61 1 7 437 37 (09/08-09/14/2024) 22 19 13 72 4 32 23 31 18 27 46 9 316
Total 467 364 674 1230 5 7 455 336 656 544 804 2096 255 7938 Numbers reflect finalized results; data are subject to change as additional test results are finalized.
Chikungunya and Dengue, Reported in Massachusetts by County of Residence, 2024 (These data are current as of 9/16/2024 and are subject to change)
County | Chikungunya virusinfection | Dengue Fever |
Barnstable | 1 | 1 |
Berkshire | 0 | 0 |
Bristol | 0 | 2 |
Dukes | 2 | 0 |
Essex | 0 | 7 |
Franklin | 0 | 0 |
Hampden | 0 | 2 |
Hampshire | 0 | 2 |
Middlesex | 8 | 24 |
Nantucket | 0 | 0 |
Norfolk | 0 | 14 |
Plymouth | 0 | 2 |
Suffolk | 3 | 32 |
Worcester | 1 | 14 |
Total | 15 | 100 |
Note: Cases listed above were travel-acquired unless otherwise noted