The U.K. Daily Express reports that 50 U.S. children have become sick with Salmonella after emulating the heroine in Disney’s latest film, The Princess And The Frog.

Doctors blamed the cases in 25 US states on youngsters kissing frogs after seeing the film. Most were under 10, with half being girls.

Experts in the US and UK urged parents not to allow their youngsters to copy Princess Tiana after seeing the animated film, which is out on Friday. Trevor Beebee, president of the British Herpetological Society, said: “Kissing frogs is not hygienic and they also have various toxic things on their skin, which are unpleasant.”

The Health Protection Agency advises against kissing any reptiles, saying: “All should be presumed to carry salmonella in their gut, even if they do not show any signs of infection.”