00423nam a2200121Ia 450000500170000010000190001724500580003626000090009452001560010358300190025994200060027899900170028420260716043304.0  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  cA  c44160d44160