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First human case of West Nile virus of the year confirmed in Mass.
Massachusetts health officials announced the second human case of West Nile virus this year, involving a man in his 60s exposed in Middlesex County. The risk level has been elevated to high in several communities, and officials urge prevention measures as mosquito season peaks.
Second human case of West Nile virus confirmed in Massachusetts
State health officials announced the second human case of West Nile virus in Massachusetts this year on Monday. A man in his 60s was exposed to the virus in Middlesex County, according to officials. The first case, announced on Aug. 20, involved a man in his 90s who was also exposed in Middlesex County.
As a result of these cases, the exposure locations, and ongoing mosquito testing, the risk level for West Nile virus has been elevated to high in Boston, Brookline, Cambridge, Everett, Newton, Somerville, and Watertown, officials said. Dozens of other communities in Suffolk, Middlesex, Essex, Worcester, Norfolk, Bristol, Plymouth, Barnstable, Hampden, Franklin, Hampshire, and Berkshire counties have a moderate risk level, according to state data.
Risk and peak season
Public Health Commissioner Robbie Goldstein emphasized the current danger, saying, "We are currently in peak season for WNV in mosquitoes, and the risk for many across Massachusetts is high." In a previous statement, he noted that "West Nile virus can be a [devastating] disease, especially for those who are older or have compromised immune systems." He added, "Those who are older or have compromised immune systems are especially at risk."
State Epidemiologist Dr. Catherine M. Brown recommended preventative measures: "People should use mosquito repellent with an EPA-registered active ingredient, clothing to reduce exposed skin, and consider rescheduling outdoor activities that occur during the evening or early morning when mosquitoes are most active," until the first hard frost.
Virus background and statistics
West Nile virus is a mosquito-borne illness that can cause flu-like symptoms, according to the Centers for Disease Control. Most infected individuals do not experience symptoms, but severe illness can lead to hospitalization or death. The virus was first identified in the United States in 1999, according to the Massachusetts health department.
The first West Nile virus-positive mosquitoes collected in the state in 2026 were announced on June 16, officials said. So far this year, the virus has been detected in 184 mosquito samples from every county except Nantucket County, according to state data. Another report cited 180 mosquitoes with the virus detected since June 16 across multiple counties.
In terms of symptoms, 80% of infected people show little to no symptoms. A smaller number—20%—may experience fever, headache, body aches, nausea, vomiting, and sometimes swollen lymph glands, the state health department said. People over 50 are most at risk for a serious case.
Treatment and prevention
The CDC notes there is no direct treatment for West Nile virus, as antibiotics do not treat viruses. Severe illness often requires hospitalization for supportive care, such as intravenous fluids, pain medication, and nursing care. About 1 out of 150 infected individuals may develop a severe, sometimes fatal illness.
Prevention tips from state health authorities include using EPA-registered repellents such as DEET, permethrin, picaridin, oil of lemon eucalyptus, or IR3535; avoiding peak mosquito activity hours between twilight and sunrise; repairing screen holes; and draining standing water. Residents are also advised to consult a veterinarian about mosquito repellents approved for animals.
Context
The announcement of the second human case follows news of the first case, which was accompanied by detection of Eastern equine encephalitis virus in mosquitoes. In Worcester and Bolton, mosquitoes also tested positive for West Nile virus earlier in the month. The state maintains an online map showing areas of high risk.
How each outlet told it
boston.com
Framing: Headline emphasizes the first human case of the year, highlighting the confirmation. Leaves out the specific date and the man's age. — Informative with a cautionary tone, using quotes about risk and prevention.
Facts Included:
First human case of West Nile virus this year confirmed in Massachusetts
Man in his 90s exposed in Middlesex County
Announcement made Thursday by Massachusetts Department of Public Health
Two mosquitoes tested positive for Eastern equine encephalitis virus in Plymouth County one day after
Risk of West Nile virus elevated to moderate level in 70 communities across Barnstable, Berkshire, Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, Worcester counties
First mosquito tested positive for WNV on June 16
180 mosquitoes with the virus detected across 13 counties (listed)
Quote from Public Health Commissioner Robbie Goldstein: 'West Nile virus can be a [devastating] disease, especially for those who are older or have compromised immune systems. This first case in Massachusetts should remind people across the state that risk remains high.'
Quote from State Epidemiologist Dr. Catherine M. Brown about using repellent, clothing, rescheduling activities until first hard frost
Framing: Emphasizes the identification of the second human case, focusing on the official identification aspect. Leaves out details like the man's age and location. — Measured and informative, with a cautionary note: quote from Goldstein about high risk.
Facts Included:
Second human case of West Nile virus announced on Monday
Man in his 60s exposed in Middlesex County
First case announced Aug. 20, man in his 90s exposed in Middlesex County
Risk level elevated to high in Boston, Brookline, Cambridge, Everett, Newton, Somerville, Watertown
Dozens of other communities in Suffolk, Middlesex, Essex, Worcester, Norfolk, Bristol, Plymouth, Barnstable, Hampden, Franklin, Hampshire, Berkshire Counties have moderate risk
Quote from Public Health Commissioner Robbie Goldstein: 'We are currently in peak season for WNV in mosquitoes, and the risk for many across Massachusetts is high.'
West Nile virus is mosquito-borne, can cause flu-like illness, most infected persons asymptomatic, severe illness can lead to hospitalization or death
Quote from Goldstein: 'Those who are older or have compromised immune systems are especially at risk.'
First WNV-positive mosquitoes collected in 2026 announced June 16
184 mosquito samples tested positive so far, in every county but Nantucket County
Tips for avoiding mosquito-borne viruses (list not detailed)
Framing: Headline emphasizes the confirmation of the second case in 2026. Leaves out the date and age of the victim. — Informative and instructional, with a focus on providing comprehensive details about the virus, symptoms, treatment, and prevention.
Facts Included:
Second human case confirmed on Monday, Aug. 24
First case was man in his 90s in Middlesex County
Second case man in his 60s also exposed in Middlesex County
Risk elevated to high in Boston, Brookline, Cambridge, Everett, Newton, Somerville, Watertown
Mosquitoes tested positive for WNV in Worcester and Bolton earlier in the month
West Nile virus is mosquito-carried, can cause mild fever to encephalitis or meningitis
First identified in the US in 1999
80% of infected people have little/no symptoms
Symptoms include fever, flu-like illness; 20% have fever, headache, body aches, nausea, vomiting, swollen lymph glands
People over 50 most at risk for serious case
No direct treatment; severe illness may require hospitalization for supportive treatment
1 out of 150 infected develop severe sometimes fatal illness
Prevention tips: use EPA-registered repellent (DEET, permethrin, picaridin, oil of lemon eucalyptus, IR3535), avoid peak mosquito hours (twilight to sunrise), repair screens, drain standing water, speak to veterinarian about repellents for animals
Each row is one claim, attributed to the outlet whose wording states it most clearly. Confidence rates how directly the source text states the claim — explicit and unhedged rates high; hedged, pieced-together, or internally inconsistent statements rate lower. It does not measure whether the claim is true. Status counts the distinct outlets we found asserting it — so a single-source claim can still show high confidence, and a multi-source claim can show medium. Every one of those outlets is named beside the status, so you can check the count against the list. For claims extracted before we began storing that list, the row says so: it names the outlet the claim is quoted from and states that we have not recorded which outlets backed it. Outlets wrote at different times, so a figure that evolves — a casualty count, for example — can legitimately differ between rows; check the "as of" time next to each claim's source.
Claim
Confidence
Status
ClaimState health officials announced the second human case of West Nile virus in Massachusetts since the start of the year on Monday.
ClaimThe first human case of West Nile virus in Massachusetts this year was announced on Aug. 20, involving a man in his 90s exposed in Middlesex County.
ClaimThe risk of West Nile virus was elevated to a moderate level in 70 communities across Barnstable, Berkshire, Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, and Worcester counties, according to the Massachusetts Department of Health.
ClaimPublic Health Commissioner Robbie Goldstein said: 'We are currently in peak season for WNV in mosquitoes, and the risk for many across Massachusetts is high.'
ClaimSince June 16, 180 mosquitoes with West Nile virus have been detected across Barnstable, Berkshire, Bristol, Dukes, Essex, Franklin, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, Suffolk, and Worcester counties, according to the Massachusetts Department of Health.
ClaimPublic Health Commissioner Robbie Goldstein said: 'West Nile virus can be a [devastating] disease, especially for those who are older or have compromised immune systems. This first case in Massachusetts should remind people across the state that risk remains high.'
ClaimState Epidemiologist Dr. Catherine M. Brown advised people to use mosquito repellent with an EPA-registered active ingredient, wear clothing to reduce exposed skin, and consider rescheduling outdoor activities during the evening or early morning when mosquitoes are most active, until the first hard frost.
ClaimThe Massachusetts Department of Health announced the first human West Nile virus case this year on Thursday, and the announcement came one day after two mosquitoes tested positive for Eastern equine encephalitis virus in Plymouth County.
ClaimThe second human case of West Nile virus was confirmed in Massachusetts on Monday, Aug. 24, according to a Massachusetts Department of Health press release.
ClaimWest Nile virus is a mosquito-carried virus that can cause illness ranging from a mild fever to more serious disease like encephalitis or meningitis, according to the state Department of Health.
Claim20% of West Nile-infected people will have symptoms such as fever, headache, body aches, nausea, vomiting and sometimes swollen lymph glands, according to the state health department.
ClaimThe state health department recommends applying insect repellent with an EPA-registered ingredient (DEET, permethrin, picaridin, oil of lemon eucalyptus, or IR3535) when outdoors.
ClaimThe state health department advises being aware of peak mosquito hours, which are between the darkest period of twilight when the sun sets to sunrise.
ClaimThe state health department advises repairing holes in screens, ensuring screens are tightly attached to windows and doors, and draining standing water to prevent West Nile virus.
ClaimThe state health website says owners should speak with their veterinarian about mosquito repellents approved for use in animals and vaccinations to prevent WNV and EEE.