00376nam a2200097Ia 450000500170000010000190001724500580003626000090009452001560010358300190025920260716043304.0  aEllison, Carol  aOn guard : 20 utilities that battle the virus threat.  c1991  aPresents the result of tests carried out using 20 antivirus utilities against 6 prevalent viruses to find out which programs take the best precautions.  c3/7/00kM2LMGR