The alternative text for this image may have been generated using AI. Genomes of many viruses contain a high proportion of ‘ORFan’ genes; that is, genes without detectable homologues in current ...

In terms of viral infections, one normally thinks of a virus infecting the cells of bacteria, plants, or animals. The idea of one virus acting as a parasite towards another one rarely comes to mind.

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After Mimivirus, Mamavirus and the virophage, the group of giant viruses now has a new member called Marseillevirus. The new virus was discovered in an amoeba by a team of French researchers. Their ...