In 2008, Peet volunteered to be a spokeswoman for Every Child By Two (ECBT), a non-profit organization that advocates childhood vaccination. Peet began working with the group after becoming concerned by the "amount of misinformation floating around [about vaccines], particularly in Hollywood." In an interview with Cookie, Peet stated: "Frankly, I feel that parents who don't vaccinate their children are parasites," referring to the benefit unvaccinated children derive from herd immunity and the concern that dropping vaccination rates may put all children at increased risk of preventable disease. Peet's comments stirred controversy; in response, she apologized for using the term "parasites," but affirmed her position on the importance and safety of vaccinations.
