Codename: Kids Next Door

'Codename: Kids Next Door', also known as KND, is an animated television series created for Cartoon Network. The show centers around Sector V, a group of ten-year-olds who are part of the international organisation of children the Kids Next Door, who fight against teenage and adult villains, as well as fellow kid adversaries. The pilot aired in 2001, and the series ran for six seasons between 2002 to 2008.

S5E6B: Operation: O.U.T.B.R.E.A.K
Believing that Patient C in the Deep-Sea Science Lab has cooties, Numbahs 2, 3, 4 and 5 activate their suits' hazmat mode. Numbah 4's suit remains in hazmat mode for the rest of the episode while he suffers from an allergic reaction to coconut candy bars.