This story is co-published with USA TODAY.

One of the most popular flea and tick collars in America poses “too great a risk to animals and humans” and should be removed from the market, a congressional subcommittee recommended in a report released Wednesday ahead of its hearing titled “Seresto Flea and Tick Collars: Examining Why a Product Linked to More than 2,500 Pet Deaths Remains on the Market.”

The House Subcommittee on Economic and Consumer Policy, which is a part of the House Oversight Committee, the main investigative body in the U.S. House of Representatives, held the hearing Wednesday afternoon. The aim was to probe the Environmental Protection Agency’s “failure to regulate the Seresto collar as well as Elanco’s refusal to take action to protect pets and their owners from the collar’s harm.” 

Owners of two deceased pets testified, as did former EPA scientist and policy analyst Karen McCormack and the environmental health science director for the nonprofit Center for Biological Diversity Nathan Donley. All spoke against the pet collar.

Jeffrey Simmons, the president and CEO of Elanco, which manufactures Seresto, also testified. He called the product safe. 

“No product is without risk,” Simmons told the subcommittee. “What matters is whether those risks are reasonable, in light of the benefits. Numerous studies and the incident report data for Seresto demonstrate the product does not pose an unreasonable risk.”

Subcommittee Chairman Rep. Raja Krishnamoorthi (D – Illinois) at the June 15, 2022, hearing.

Subcommittee Chairman Rep. Raja Krishnamoorthi (D – Illinois) launched an investigation into the collar in March 2021, after reporting by Investigate Midwest and USA TODAY revealed the high number of incidents related to the collar, as well as the EPA’s inaction despite knowing about the issue for nearly a decade.

“It is unacceptable that the EPA has been aware of the Seresto collar’s safety concerns for years and has continued to allow Americans to unknowingly put their pets in danger by using a product they have been led to believe is safe,” Krishnamoorthi told Investigate Midwest and USA TODAY in a statement. 

Since it entered the U.S. market in 2012, Seresto has been linked to at least 98,000 adverse incidents and 2,500 pet deaths – the most of any such product regulated by the EPA and the source of internal alarm among some agency employees, records previously obtained by USA TODAY and Investigate Midwest show.

Jeffrey Simmons, Elanco’s president and CEO, virtually testifying before the subcommittee on June 15, 2022.

Elanco said it “unequivocally” stood behind the safety of the collar.

“Numerous studies and the incident report data for Seresto demonstrate the product does not pose an unreasonable risk and has a strong safety profile, which is why the American Veterinary Medical Association opposed canceling Seresto’s EPA registration,” said company spokeswoman Keri McGrath Happe in a statement Wednesday. (Read Elanco’s full statement here.)

In an emailed statement, EPA spokeswoman Melissa Sullivan said that the EPA is conducting a review of the product, with assistance from the Food and Drug Administration, which it expects to wrap up in fall 2022.

“Upon completing its analysis and assessment, EPA will determine whether these pet collar registrations can still be used safely according to the instructions on the label or if additional safety measures or cancellations are needed for these products,” she said.

The EPA did not answer a question about why it does not have anyone scheduled to speak at today’s hearing. (Read the EPA’s full statement here.)

[Read more: Popular flea collar linked to almost 1,700 pet deaths. The EPA has issued no warning.]

Elanco has repeatedly defended the collar, which is its top product, accounting for 8% of revenue annually. The company said the rate of complaints is a fraction of the overall sales — which have surpassed 34 million in the past decade — and that the rate has declined over the years. It also said that most incidents are classified as “minor” or “moderate” and that the pet did not suffer “any significant or permanent harm.”

Elanco — which bought the entire Bayer Animal Health unit, including Seresto, from the German pharmaceutical giant in 2020 for $7.6 billion — has said its own extensive studies into the product show that the incidents of harm reported by pet owners are likely related to other factors and not the collar itself. 

But the subcommittee’s investigation casts doubts on those claims. In a 22-page report that heavily cites reporting and documents published by Investigate Midwest and USA TODAY, as well as never-before-released information, the subcommittee reveals new details about how  Seresto “may be the most dangerous flea and tick product on the market” and that the EPA knew it.

For example, as early as 2015, EPA discovered that Seresto had the highest rate of total incidents as well as death or major incidents of any such product the agency regulates. “Compared to the second most dangerous product, Seresto had nearly three times the rate of total incidents, and nearly five times the rate of ‘Death’ or ‘Major’ incidents. Compared to the third most dangerous product, the Seresto collar had nearly 21 times the rate of total incidents, and over 35 times the rate of ‘Death’ or ‘Major’ incidents,” the report said. 

The report also details how, in determining whether to approve the sale of Seresto in its country, Canada’s Pest Management Regulatory Agency (PMRA) reviewed data on roughly 1,000 of the most serious death and major pet incidents linked to the collar and found that it “probably or possibly caused 77% of these incidents.” This led the agency in 2016 to deem the collar too dangerous to sell, and PMRA rejected the product’s application even as sales of Seresto continued in the United States. 

Among the cases that PMRA linked to Seresto, the congressional report noted, pets experienced symptoms including skin problems, “lethargy, abnormal behavior, excessive grooming and vocalization, vomiting, diarrhea, and anorexia.” More than a third involved problems in “multiple organ systems,” with some experiencing “convulsions, muscle tremors, and loss of control of bodily movements.” Ten percent of those pets died or were euthanized after wearing the collar.

Faye Hemsley fought off tears during the hearing while describing what happened to her dog, Tigger. Hemsley, of Huntingdon, Pennsylvania, said that shortly after putting a Seresto collar on Tigger’s neck, the dog became lethargic. Shortly later, he died in her son’s arms as he was preparing to take the dog on a walk. She said she was hoping her testimony could lead to other people avoiding problems with Seresto.

“We miss him every day and the cuddles he gave us,” Hemsley said.

Pet owners, too, experienced adverse effects after coming into contact with the collar, according to the congressional report. Symptoms included hives and dermatitis, but also more serious problems like “respiratory, neurological, and digestive effects, with throat irritation, breathing difficulty, dizziness, and nausea.”

“Notably, these observed effects on humans were consistent with clinical studies into Imidacloprid –one of the collar’s main active ingredients,” the congressional report noted.

[Read more: The EPA internally raised concerns about Seresto flea collar for years, new records reveal]

The Canadian agency also factored in Seresto’s sales data and found that its collars had an incident rate of 36 to 65 incidents per 10,000 collars sold. PMRA considers one incident per 10,000 collars sold as indicative of a potential problem, the report stated. By comparison, 15 pet collars sold in Canada at the time averaged 0.07 incidents per 10,000 collars sold.

“Seresto’s incident numbers were also trending in the wrong direction: PMRA expressed ‘additional concern’ over the fact that Seresto’s total incident numbers had nearly doubled every year since 2013,” according to the congressional report.

The EPA’s own peer review of Canada’s analysis “found an even stronger connection between Seresto collar use and deaths,” the report said. The Canadian agency had examined 251 pet deaths linked to Seresto and determined that 33% of them were “probably or possibly” caused by the collar. When the EPA independently reviewed the same 251 pet deaths, it “concluded that 45% – or 113 – of the deaths were probably or possibly caused by the collar.”

Yet the EPA did nothing to warn the public and did not require Bayer — and later Elanco — to do anything differently to make its product safer or place a warning label on the packaging as countries like Colombia and Australia had required, the congressional report noted. 

For example, the EPA proposed in 2019 that Bayer separate its registrations for the collar so that there was one for cats and one for dogs. The rationale being that the EPA could better analyze incident data for the different products. Bayer rejected this proposal, citing the administrative burden it would cause. The EPA thanked the company for its consideration and backed down, according to the congressional report. 

The EPA also asked Bayer to update Seresto’s warning label as it had done in other countries. Germany’s label, for example, notes the collar poses neurological risks; Colombia’s label calls it highly toxic; Australia’s label simply says “POISON.” Bayer, and later Elanco, refused this proposal, and the label remained unchanged, the report said.

At one point, Simmons said Elanco would be willing to work with the EPA on science-supported changes to its labeling, but its studies into Seresto show the product is not harmful.

The product’s “value is significant,” he said. “The risk is reasonable.”

“With all respect, Mr. Simmons, it’s not your job to decide if the risk is reasonable,” Rep. Katie Porter (D-California) replied. “That’s the job of the regulatory body. 

“My concern is that (Elanco) is standing in the way of allowing the EPA to gather those necessary data and make that necessary decision,” she continued. “I encourage Elanco to work with the EPA to get this data, and if they won’t, then Seresto will have to come off the market. Too many families have suffered already.”

The congressional report also states that documents obtained by the subcommittee “show that Bayer and Elanco relied on dubious justifications to explain adverse incidents caused by the Seresto collar” and called into question its claim about the “Weber effect.”

The Weber Effect is a theory that “the number of incidents linked to a product will peak at the end of the second year after regulatory approval, followed by a steady decline as the market becomes familiar with the product,” the report states. But when Bayer continued to use this justification during a July 2019 meeting between the company and the EPA, reported animal deaths had continued to climb each of the seven years the collar had been on the market.

But Elanco said in a statement to USA TODAY and Investigate Midwest that the rate of incident reports has been decreasing. According to the company’s own numbers, McGrath Happe said, the rate was 17.26 per 10,000 collars sold in 2021.

“That’s less than a fifth of 1% reporting rate across-the-board,” she said. “More than 93% of incident reports received for Seresto pet collars in the U.S. from January 2013 to December 2021 are classified after careful analysis as ‘minor’ (70.65%) or ‘moderate’ (22.59%), with the vast majority being redness or irritation at the site of the collar. In analyzing all reports, the data show no established link between the active ingredients in Seresto and pet death.”

Krishnamoorthi said that Elanco’s science did not pass the smell test, when compared to EPA and PMRA findings. 

When asked about this discrepancy, Donley said it’s common that a third-party consultant would find different results.

“If you’re profiting off of something then you’re likely to find it much safer than an independent scientist would,” he said.

In addition to its demands that Elanco voluntarily recall its collar and the EPA cancel the product’s registration, the subcommittee also recommends that the EPA change the way it collects incident data and allocates necessary resources to investigate these incidents.

“Following the Subcommittee’s disturbing findings,” Krishnamoorthi said, “I believe the EPA must expand its data collection standards and more strictly follow its scientific review process to ensure that dangerous products are not permitted to stay on the market and threaten the welfare of pets that so many Americans view as family.”

Rep. Hank Johnson (D – Georgia) expressed disappointment that the EPA has failed to take action for years, and it was only after the public learned about Seresto’s harms through media reports and a petition to cancel by the Center for Biological Diversity that the EPA took any action.

“When it came to protecting man’s best friend,” he said, “we couldn’t count on the EPA.”

UPDATE: This story was updated soon after publication with comment from Elanco. This story was updated twice in the afternoon following publication with information from the Congressional hearing.

Top image: During a June 15, 2022, hearing on Seresto collars, Rep. Raja Krishnamoorthi (D – Illinois) points to three different analyses of harmful incidents linked to the collars: 1) Elanco’s own research, 2) Canadian health authorities’ research and 3) the EPA’s.

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1 Comment

  1. I am positive the Soresto collars caused two of my dog’s deaths! One died quickly from an autoimmune disease and years later after wearing collar a second dog died from lymphoma. How much evidence and data of harm and deaths does it take fir the EPA to remove them from our country. ?

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