If the maker of antivirus software wants to be successful, the software has to be as close to bulletproof

If the maker of antivirus software wants to be successful, the software has to be as close to bulletproof as the maker can possibly make it. Nothing is perfect; we certainly should understand at this point that no software can be proven bug free and that no security posture is 100% risk-free. Based on this statement, what do you think it could be better to improve the antivirus software? How safe do you feel to use antivirus software in your organization, and what other precautions do you use to prevent virus, malware, etc.?