One possible interpretation, controversial among virus experts, is that the monkey virus had recently crossed into humans.

The other interpretation was inadvertent contamination of the supposed human specimens with monkey viruses.

We were looking at mouse cells that had been infected with a monkey virus.

Studies with similar results involving monkey viruses related to H.I.V. will soon be published.

With so many sick monkeys running around it, the island could have become a focus for monkey viruses.

List of monkey viruses (and those that infect humans)

Recently, some scientists have suggested that this virus may actually be identical to one of the known monkey viruses.

Evidence suggests that the African green monkey virus does not make monkeys sick.

The monkey virus is the closest animal counterpart of HIV.

The monkey virus is used because it can stimulate immunity in a human being without causing illness.