Poisons on Pets
Health Hazards from Flea and Tick Products
This article is from the NRDC
EXECUTIVE SUMMARY
Each year, Americans purchase and apply to their pets a vast array of toxic chemicals intended to kill fleas and ticks. These products are designed to poison insects, and they usually do just that. But they can also poison pets and the people who handle them. Moreover, when these products are combined in the home, as they often are, with other toxic chemical products in common use -- pesticides, herbicides, and other products -- they can pose a serious health risk, especially to children.
Adults are at risk from these flea and tick products as well -- pet workers who apply pesticides to animals on a daily basis, for example. But it is children who are most vulnerable. Because children’s bodies are still developing, they can be more sensitive to the effects of toxic chemicals than adults. Studies with laboratory animals have raised concerns among scientists that children exposed to certain of the pesticides in pet products -- even at levels believed to be safe for adults -- face much higher risks, not only for acute poisoning, but also for longer-term problems with brain function and other serious disease. Moreover, children’s behavior often makes them more vulnerable than adults. In particular, toddlers’ hand-to-mouth tendencies make it easy for toxics to be ingested -- and not just by children who pet the family dog and then put their hands in their mouths. Children spend their time where the toxics from pet products tend to accumulate -- crawling on rugs, playing with pet toys, handling accumulations of household dust, and more.
Many and perhaps most Americans believe that commercially available pesticides, such as those found in pet products, are tightly regulated by the government. In fact, they are not. Not until the passage of a 1996 law focused on pesticides in food did the Environmental Protection Agency (EPA) begin examining the risks from pesticides in pet products in earnest. To this day, the EPA allows the manufacture and sale of pet products containing hazardous insecticides with little or no demonstration that a child’s exposure to these ingredients would be safe. Just because these products are on store shelves does not mean they have been tested or can be presumed safe.
Of course, as bad as these products may be for pet owners and caregivers, they often are worse for the pets themselves. Based on the very limited data available, it appears that hundreds and probably thousands of pets have been injured or killed through exposure to pet products containing pesticides. As with small children, pets cannot report when they’re being poisoned at low doses.
Healthier alternatives to these pesticides are readily available. Easy physical measures like frequent bathing and combing of pets can make the use of pesticides unnecessary. Pet products containing non-pesticide growth regulators also can stop fleas from reproducing successfully. In addition, newer insecticides, sprayed or spotted onto pets, have been developed that are effective against fleas and ticks without being toxic to the human nervous system. The safety and effectiveness of these alternatives makes the continued use of older, more toxic pet products tragically unnecessary.
Pet Pesticides at Work
Approximately 90 percent of American households use pesticides. According to one study, 80 percent of families surveyed have used pesticides at home even when a woman in the household was pregnant, and 70 percent have used them during a child’s first six months of life. Half of the surveyed families reported using insecticides to control fleas and ticks on pets. More than a billion dollars a year are spent on flea and tick products.
Unfortunately, the wide use of these products is no indication that they are safe. Quite the contrary, the pesticides they introduce into the home include chemicals that are hazardous to the human brain and nervous system, chemicals that may disrupt the human hormone (endocrine) system, and pesticides suspected of causing cancer.
Flea control products now on the market include seven specific "organophosphate insecticides" (OPs). OPs work by blocking the breakdown of the body’s messenger chemical, acetylcholine, thereby interfering with the transmission of nerve signals in the brains and nervous systems of insects, pets and humans alike. In the presence of OPs, acetylcholine builds up in the body. The resulting interference with nerve transmissions is of such a magnitude that it actually kills insects. In overdoses, OPs can also kill people and pets. But even with normal use of flea-control products containing OPs, pets and children may be in danger.
The seven OPs are chlorpyrifos, dichlorvos, phosmet, naled, tetrachlorvinphos, diazinon and malathion. They are the active ingredients in dozens of pet products. A comprehensive list of products appears in Table 1. It includes major pet pesticide brands, such as Alco, Americare, Beaphar, Double Duty, Ford’s, Freedom Five, Happy Jack, Hartz, Hopkins, Kill-Ko, Protection, Rabon, Riverdale, Sergeant, Unicorn, Vet-Kem, Victory and Zema.
Organophosphate chemicals are also used on foods and in other common household products designed to kill non-pet-borne insects. For families exposed to these toxic chemicals, however, the route into the home and the specifics of how the chemicals work are less relevant than the plain fact that they pose a health threat. From a health standpoint, a person’s combined exposure to one of these OPs, irrespective of its individual uses, is what is important. Further, because the various OPs all function by attacking the same chemical in the body, acetylcholine, exposure to a variety of OPs could have a combined impact.
The Natural Resources Defense Council is the first to put the individual risk assessments for pesticides from pet products side by side, highlighting the overall risks to children. EPA continues to look at these OP risks only one chemical at a time. The Agency has simply never gotten around to estimating the cumulative risks children face from the myriad uses of all the different OPs to which they are exposed. Once EPA does so, the cumulative risks are sure to exceed EPA’s safe levels to a far greater degree.
The Risks
Though EPA’s assessments of the risks from OPs in pet products are new, EPA has long identified OPs generally as being among the pesticides posing the highest risks to human health. Workers exposed to these chemicals, for example, have experienced visual problems, slowed thinking, and memory deficits. In truth, however, the principal risk for humans is likely to the brain and nervous system of young children and fetuses, because their systems are still developing when they are exposed to OPs. The risks come in two forms: risks from poisoning, and risks from long-term effects on the brain and nervous system.
Children’s Risk of Acute Poisoning: OPs are considered the most dangerous pesticides for acute poisoning, particularly for children younger than six. Among incidents reported to poison control centers, children exposed to OPs were three times more likely to be hospitalized, five times more likely to be admitted to a critical care unit, and four times more likely to die, suffer life threatening illness, or develop a permanent disability, than were children who had been exposed to other types of pesticides.
Children’s Long-term Health Effects: A child’s developing brain and nervous system are particularly vulnerable to the toxic effects of OPs because these systems are not fully developed at birth and must continue to form during early childhood. Brain development requires certain cells to first grow, then migrate within the brain, and then connect with one another. Chemicals such as OPs can interrupt and have irreversible effects on this development. Studies have also shown that children exposed to OPs may face increased risks for such later-in-life problems as cancer and Parkinson’s disease. A recent epidemiological study, for example, showed that people with any history of in-home exposure to insecticides, like OPs, can more than double the risk of Parkinson’s later in life. In addition, four OPs used in pet products increase cancers in laboratory animals, and therefore may cause cancer in humans. One epidemiological study that looked, among other things, at pregnant women who had been exposed to flea and tick products, found that their children were 250 percent more likely than those in a control group to be diagnosed with brain cancer before their fifth birthday.
Of course, it is not only children who are at risk. Pets and pet workers are vulnerable as well.
Pet Poisonings. In recent years, hundreds, if not thousands, of pets have been poisoned by pesticide products specifically designed for use on pets. Products containing OPs are among the worst culprits. EPA finds that these pet products are frequently misused and that such misuse should be anticipated by manufacturers. Cats are particularly vulnerable, since they often lack key enzymes for metabolizing or detoxifying OPs. As with children, a cat’s small size and unique behavior -- in this case, grooming -- work against them as well, making them particularly vulnerable to OP poisoning.
Pet Worker Poisonings: Over a recent four-period, at least 26 adults working with pesticide pet dips were poisoned. Nearly half of these cases involved the OP, phosmet. Moreover, a survey of nearly 700 adults who worked with flea control products found that these workers were two-and-a-half times more likely to have health problems than workers not exposed to such products. The complaints included statistically significant increases in blurred vision, skin flushing and asthma. (http://www.nrdc.org/health/effects/pets/execsum.asp)
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