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10 Americans Dead From Mosquito Borne Illness

The Massachusetts Department of Public Health reported on Wednesday there’s been a fourth death in the commonwealth from Eastern equine encephalitis, bringing the nationwide total to 10 deaths.

An area hospital notified state officials of the death. The patient lived in Essex County.

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There have also been three deaths in Michigan, two in Connecticut and one in Rhode Island.

Eastern equine encephalitis, known as EEE, is a rare virus transmitted by mosquitoes. There are typically only 5 to 10 human cases reported in the United States each year, according to the US Centers for Disease Control and Prevention. About 30% of all cases result in death. This year there has been an uptick in the number of reported cases, nearly 30 among several states.

Tests also confirmed an 11th human case of the mosquito-borne virus in Massachusetts. The patient is a man in his 70s who lives in Worcester County.

With this latest infection, Massachusetts elevated several more communities to high risk. The communities of Auburn, Charlton, Dudley, Leicester, Southbridge and Spencer are now included in the 46 communities considered to be at high risk. There are also 35 communities at critical risk and 122 at moderate risk.

EEE virus has been found in 422 mosquito samples in Massachusetts this year, according to the department, many in species that are capable of spreading the virus to humans. The mosquitoes can also infect animals. There is a vaccine for horses who get EEE, but there is no vaccine for humans.

“Although mosquito populations are declining at this time of year, risk from EEE will continue until the first hard frost,” said State Epidemiologist Dr. Catherine Brown. “We continue to emphasize the need for people to protect themselves from mosquito bites.”

Massachusetts has done some aerial spraying to kill mosquitoes, but the state is done for this season. The spraying helps reduce the risk of EEE, but the risk will persist until that first hard frost.

The health department encourages people to wear long pants, socks and long sleeves to reduce the amount of skin exposed to the bugs. Use bug spray and limit outdoor activities to an hour before sunset up until dawn. That’s when the bugs bite the most.


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  1. In my state there is a long established program for mosquito abatement/control with regular protocols every week. We have a very long warm season so our programs will continue through end of January. West Nile and numerous other serious illnesses are carried by mosquitoes in our region.

    More human beings are killed by mosquitoes than all wars in world history and continuing into the present moment.

  2. I used to make vaccines to EEE, WEE (W = Western) and VEE (V = Venezuelan) viruses when there were biological warfare (BW) strains of these viruses that had been weaponuzed. Then, those strains produced much higher martslities than we are seeing today. But the VEE was a good weapon because it failed nearly 90% morbidity but low mortality requiring more manpower to treat cases. The WEE was a good second choice since mortality was “only” around 30-50%. But the EEE was known to cause over 80% mortality. Yes, all of us who worked on any of these BW agents ( and others) had to be vaccinated before working in Bio Isolation Class 3A lab lab suites.

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