The virus can pass from mother to infant in the womb.

There is no information about whether those viruses pass into human breast milk.

All three had breaks in the skin through which the virus may have passed, and one was exposed to the patient's blood for 20 minutes.

One reason may be that the virus passes less easily from women to men than vice versa, though this is not yet certain.

They said each of the three workers described today had small breaks or other abnormalities in the skin through which the virus might have passed.

All three had small breaks or other abnormalities in the skin through which the virus might have passed.

At the moment, the virus cannot pass easily from one person to another.

No one knows how this virus passes through winter.

Figuring out precisely how cold viruses pass between people has been particularly vexing.

Ten years into the epidemic, there is no evidence to suggest that the virus can pass between two people in any other way.