Disinfectant (software)

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Disinfectant software icon
Developer(s) John Norstad at Northwestern University
Initial release March 18, 1989; 28 years ago (1989-03-18)[1]
Stable release
3.7.1[2] / July 1997; 20 years ago (1997-07)[2]
Development status Discontinued[3][4]
Operating system Classic Mac OS
License Freeware[3]

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.[3] Disinfectant featured a system extension that would detect virus infections and an application with which users could scan for and remove viruses.[5] New versions of Disinfectant would be subsequently released to detect additional viruses.[5] Bob LeVitus praised and recommended Disinfectant in 1992.[6] 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][4]


  1. ^ Norstad, John (1998-10-11). "Disinfectant Retired". Retrieved 2016-04-06. 
  2. ^ a b Ducan, Geoff (1997-07-14). "Disinfectant 3.7.1". TidBITS. Retrieved 2016-04-06. 
  3. ^ a b c d e Anbinder, Mark H. (1998-05-11). "John Norstad Retires Disinfectant". TidBITS. Retrieved 2016-04-06. 
  4. ^ a b "Disinfectant: Macintosh Anti-Virual Utility". Apple Inc. 2012-02-18. Retrieved 2016-04-06. 
  5. ^ a b Borrell, Jerry (1991-01-01). Macworld Read Me First Book. IDG Books. p. 219. 
  6. ^ LeVitus, Bob (1992). Dr. Macintosh's Guide to the On-Line Universe. Addison-Wesley. p. 270.