State agencies are warning Wisconsinites to limit the amount of ducks that they eat, or to avoid certain birds entirely, due to PFAS contamination. Waterfowl harvested around Green Bay were shown to have high levels of the man-made “forever chemicals,” which persist in the environment forever and have been linked to several chronic diseases including cancers.
The Department of Natural Resources (DNR) and Department of Health Services (DHS) are advising people not to eat mallards from around lower Green Bay from Longtail Point to Point au Sable, and south of the mouth of the Fox River. Additionally, mallards and wood ducks living around Green Bay from the city of Marinette across to Sturgeon Bay should not be consumed frequently — no more more often than once per month for mallards and only one meal per week for wood ducks.
Back in 2022 levels of polychlorinated biphenyls (PCBs), another man-made chemical, in waterfowl led to similar advisories in lower Green Bay. Further assessments found concentrations of PFAS in breast muscle tissue, according to a DNR press release. In 2023 and 2024, more samples were taken from ducks, with all samples taken during July and August when the birds were most likely to represent local breeding populations. Those efforts revealed elevated levels of perfluorooctane sulfonate (PFOS), which is a type of PFAS, in the breast muscles of the birds. The inquiry suggested that both adult and juvenile ducks in lower Green Bay have higher concentrations of PFOS than in the northern portion of the bay.
PFAS chemicals were first developed as part of U.S. government nuclear and atomic weapons research during the Manhattan Project. After the project ended private companies, particularly DuPont, began researching the compounds for commercial use. Over the subsequent decades, PFAS was used in products including non-stick Teflon pans, fast food wrappers, and firefighting foam. The chemicals do not degrade in the environment, nor within the body, and have been linked to cancers and other chronic diseases.
The DNR tracks PFAS consumption advisories spanning multiple species including deer, fish and waterfowl. On Sept. 4, deer and fish advisories for PFAS were issued for the Town of Stella and surrounding waterbodies in Oneida County. All fish in the Moen Lake Chain were included in a “do not eat” advisory due to PFAS contamination, and a similar warning was distributed against the consumption of deer liver near the Town of Stella.
A nurse gives an MMR vaccine at the Utah County Health Department on April 29, 2019, in Provo, Utah. The vaccine is 97% effective against measles when two doses are administered. (Photo by George Frey/Getty Images)
The Wisconsin Department of Health Services (DHS) is urging residents to get vaccinated amid the confirmation of the first measles cases in the state this year and as families begin back-to-school preparation with vaccine rates still down.
DHS confirmed nine cases of measles in Oconto County over the weekend — the first cases in the state this year. The agency said no public points of exposure have been identified and the risk to the community remains low.
The first case was confirmed through testing at the Wisconsin State Laboratory of Hygiene, and the eight other cases were confirmed based on exposure and symptoms. Each person was exposed from a common source during out-of-state travel.
Dr. Ryan Westergaard, chief medical officer of DHS’s Bureau of Communicable Diseases, told reporters during a press conference Monday afternoon that given the number of cases across the country, the agency has been preparing for its case investigations and outbreak response for months.
“While we were surprised that we had our first cases this past week, we were prepared,” Westergaard said. “We’ve been making sure that we have adequate MMR vaccine in stock and have worked in partnership with all of our local and tribal health departments to make sure that we have a solid response that everyone is aware of, and so far for this case,… things have gone well.”
Ryan Westergaard, M.D., Wisconsin Dept. of Health Services
Cases of the highly contagious disease have hit a 33-year high nationally, according to the Centers for Disease Control and Prevention (CDC). There are reports of over 1,300 cases this year, with more than 150 people having been hospitalized for measles. Three people have died this year.
Measles was declared eliminated in 2000, but decreasing vaccine rates, which have fallen below herd immunity, have led to a resurgence of the disease. Prior to 2025, the last similar outbreak was in 2019 when more than 1,200 cases were confirmed in the U.S.
Westergaard said the state agency is not considering the nine cases in Wisconsin an outbreak because the investigation found a common source during out-of-state travel. He said the agency won’t be releasing additional information about the cases due to state privacy laws. The agency has said it is working to identify and notify people who may have been exposed.
The agency is urging families to get vaccinated in light of the cluster of cases and reported Monday that vaccination rates among students mostly held steady during the 2024-25 school year. Vaccination rates are still below pre-pandemic levels.
“Vaccination is the first line of defense for your child’s health. Each vaccine is approved only after being proven safe and effective,” Stephanie Schauer, director of the Wisconsin Immunization Program, said in a statement. “Taking time now to ensure your children have received the recommended vaccines will make them less likely to get seriously ill, meaning less time out of school and away from work. And routine vaccines don’t just protect your child — they help keep classrooms and the whole community safe.”
During the 2024-25 school year, 86.4% of students met the minimum immunization requirements — a 2.8 percentage point decrease from the 2023-24 school year.
“This tells us that most Wisconsin families are protecting their children with vaccines,” Westergaard said at the press conference. “Unfortunately, this level is below where we need to be to protect our state against outbreaks of vaccine-preventable diseases. As we head into the new school year as a physician and as the father of kids who attend public schools, I want to encourage all caregivers to reach out to a trusted health care provider with any questions or concerns that you have to concern to ensure that students are up to date on their vaccines this year.”
The agency attributed the overall decrease in meeting the immunization requirement to people being unfamiliar with a new meningitis vaccination requirement for 7th and 12th grade students. Without data on the meningitis vaccination, 89.3% of Wisconsin students met the minimum requirements — a 0.1% increase from the 2023-24 school year.
DHS reported in December that families in the state have fallen behind other states when it comes to receiving childhood vaccines including polio, pertussis, diphtheria and tetanus (DTaP), and measles, mumps, and rubella (MMR). When it comes to measles in particular, Wisconsin hasone of the lowest vaccination rates in the country.
Measles can spread from person to person through the air, and the vaccines to prevent it are highly effective. One dose of the MMR vaccine provides about 93% protection from measles, while two doses are about 97% effective.
“Our school vaccination data tells us there are children in our schools who are not protected from an outbreak of preventable diseases like measles,” State Health Officer Paula Tran said in a statement. “In public health, we know that 95% of people in a community need to be vaccinated against measles in order to prevent an outbreak, which is why it’s so important to get children the vaccines they need on time.”
Milwaukee city leaders, looking to take preventative steps due to the measles cases, also urged residents to get vaccinated on Monday.
“As a father and as mayor, I take this threat seriously,” Mayor Cavalier Johnson said in a statement. “We’ve seen how quickly diseases can spread when vaccination rates fall behind.”
Children’s Wisconsin President of Pediatrics Dr. Mike Gutzeit emphasized that serious side effects from the MMR vaccine are rare.
“The risk from measles itself is far greater. When families choose not to vaccinate, they’re not just putting their own children at risk, but also newborns and people with weakened immune systems,” Gutzeit said. “Measles was nearly eliminated in the U.S., but now we’re seeing hundreds of cases and hospitalizations again. We can’t afford to go backward.”
Other vaccine-preventable illnesses surged in classrooms last year, according to DHS. Nearly 3,000 cases of pertussis, or whooping cough, were reported.
The measles cases and data on school vaccine rates come as some Republican lawmakers are seeking to increase awareness of vaccine exemptions. Sen. Rachael Cabral-Guevara (R-Appleton) and Rep. Lindee Brill (R-Sheboygan Falls) recently introduced a bill that seeks to highlight Wisconsin’s vaccine exemptions, saying there isn’t enough transparency around them. Current law already requires that schools and day care providers “inform the person in writing of the person’s right to a waiver.”
During the 2024–2025 school year, 6.7% of students had a waiver for one or more vaccinations. Of those, 5.8% of students had a personal conviction waiver, 1% had a religious waiver and 0.4% had a health waiver.
Westergaard said the rate of waivers in Wisconsin is higher than other states.
“We feel in public health that knowledge of the exemptions of the waivers is commonplace,” Westergaard said. “We don’t hide them, but our recommendation is that people get their kids vaccinated because we, as a public health entity, feel any risks far outweighed by the benefit, both to individual health and to our community health.”
Westergaard said those with concerns should speak with a trusted physician and be open with their questions.
“For many families, childhood immunizations are a fact of life, and they’ve accepted them when they’re recommended, but we know other families have questions and concerns,” Westergaard said. “If there are questions you have, if there is information that you’ve seen online or heard that makes you question the safety or the effectiveness, let’s talk about them… There’s near unanimity among people who have seriously reviewed MMR safety data and other childhood vaccine data that they are on balance very safe and very effective and continually monitored for safety and adverse effects.”
A health care provider bandages a child after giving a vaccination shot. (Photo by Scott Housely/CDC)
A pair of Wisconsin Republicans want to increase awareness of the state’s vaccine exemptions by requiring waiver forms be given to parents with the health forms they receive from schools and child care center providers.
Coauthors of the bill Rep. Lindee Brill (R-Sheboygan Falls) and Sen. Rachael Cabral-Guevara (R-Appleton) said in a cosponsorship memo that there is a “lack of transparency” around the exemptions that “can create confusion and unnecessary barriers for parents” and “increase administrative burden on schools when immunization documentation is incomplete or delayed.”
Wisconsin law requires children in elementary, middle, junior or senior high school, a child care center, or a nursery school to get vaccinated for various diseases based on their grade or age. The vaccine and booster schedule covers mumps, measles, rubella, diphtheria, pertussis, poliomyelitis and tetanus.
Wisconsin allows parents to get the requirement waived if they submit a written statement objecting for reasons including health, religious or personal conviction.
Lawmakers noted that the bill would not change current requirements for vaccines. The bill would require schools, child care centers and nursery schools to create a process to present a vaccine waiver form with each health-related form it requires before a student can be enrolled.
“Many parents are unaware of this right or are unclear about how to obtain that waiver and feel pressured to make medical decisions for their children that they otherwise would not have,” Brill said in a statement. “This bill ensures that schools make parents aware of the rights already afforded them by Wisconsin law and include information about the waiver from the vaccine requirement and a procedure for presenting it in any required pre-enrollment health-related forms.”
The proposal comes as Wisconsin’s vaccination rates have not caught up with pre-pandemic levels. According to a 2024 U.S. Centers for Disease Control report, Wisconsin is falling behind other states in childhood immunizations for illnesses including polio, pertussis, diphtheria and tetanus, and measles, mumps and rubella.
The decline in vaccine rates is partially to blame for diseases, including measles and pertussis, increasing across the country, according to health officials.
According to the Wisconsin Department of Health Services, 86.4% of students met the minimum immunization requirements during the 2024-25 school year — a 2.8 percentage-point decrease from the prior year. The agency also reports that 6.7% of students had a waiver for one or more immunizations, representing a 0.6 percentage-point increase from last year, though the number of students waiving all vaccines fell to 1.3%.
Wisconsin has one of the lowest measles vaccination rates in the country, with only Alaska falling below it. One dose of the MMR vaccine, which fights measles, provides approximately 93% protection, while two doses are about 97% effective.
As measles vaccine rates have fallen, cases of the highly contagious disease have hit the highest level in 33 years, according to the CDC with 1,288 cases this year. More than 150 people have been hospitalized from measles, and three people have died this year. No cases have been reported in Wisconsin so far, but its neighboring states, including Illinois and Minnesota, have had cases.
The lawmakers’ efforts to increase awareness of vaccine exceptions comes amid a national wave of skepticism to vaccination, including from U.S. Health Secretary Robert F. Kennedy Jr., who is a leading and prominent vaccine skeptic and was appointed by President Donald Trump this year.
Brill thanked Kennedy for his work on his “Make America Health Again” agenda in her statement about the bill.
Cabral-Guevara, a board certified family nurse practitioner, has supported legislation that would loosen vaccine requirements before including a 2024 bill that would have allowed immunization exemptions at higher education institutions without documentation.
The bill passed the Senate and Assembly, but was vetoed by Gov. Tony Evers, who said in a veto message that he objected to “the Wisconsin State Legislature’s efforts to micromanage decisions to respond to public health incidents and restrict existing tools available to higher education institutions to keep students, faculty, staff safe and healthy on their campuses.”
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