Virus Summary

Viruses Viruses are infectious agents that have no organelles or reproductive machinery of their own. Viruses cannot duplicate their DNA or RNA, nor can they translate their genetic information into p... Read more

Viruses Less than a generation ago, computer viruses were considered an urban myth. They were found more often in movies than on actual computer systems. Now, however, malicious software constitutes a... Read more

Viruses and Responses to Viral Infection There are a number of different viruses that challenge the human immune system and that may produce disease in humans. In common, a virus is a small, infectiou... Read more

Viruses A virus in nature is a tiny organism that literally hovers at the edge of the living and the non-living. If it infects a host, it comes alive, using the host's resources to rapidly make many c... Read more

Virus A virus is a small, infectious agent that consists of a core of genetic material (either deoxyribonucleic acid [DNA] or ribonucleic acid [RNA]) surrounded by a shell of protein. Viruses cause di... Read more

Viruses and Responses to Viral Infection There are a number of different viruses that challenge the human immune system and that may produce disease in humans. In common, viruses are small, infectious... Read more

Virus A virus is a submicroscopic particle that contains either RNA (ribonucleic acid)or DNA (deoxyribonucleic acid). Viruses are not capable of performing metabolic functions outside of a host cell... Read more