Mimivirus is the largest and most complex virus known. Is it an evolutionary bridge between nonliving viruses and living organisms, or is it just an anomaly? Aa Aa Aa Viruses are small and fairly ...

Perhaps the most complex virus ever created, it used various flaws in Microsoft's Web server and browser software to unleash itself without the user's knowledge. See Nimda. No relation to 9/11 in ...

They could even be a missing link in the evolutionary history of viruses, suggesting that viral genomes may have once been ...

A new Weill Cornell Medicine and Oregon Health & Science University co-authored study provides critical insight for the development of a vaccine that can more effectively block the spread of ...

Your immune system harbors a lifetime's worth of information about threats it's encountered—a biological Rolodex of baddies. Often the perpetrators are viruses and bacteria you've conquered; others ...