Disinfectant was a popular antivirus software program for the classic Mac OS.

It was originally released as freeware by John Norstad in the spring of 1989.

[4] New versions of Disinfectant were subsequently released to detect additional viruses.

[5] In May 1998, Norstad retired Disinfectant, citing the new danger posed by macro viruses, which Disinfectant did not detect, and the inability of a single individual to maintain a program that caught all of them.

[3][6] This Classic Mac OS and/or macOS software–related article is a stub.