Patient 1 had not had any known direct contact with poultry, but had cared for her 21-year-old brother (patient 2) while he had a documented H5N1 virus infection,

Our findings provide a rational explanation for why H 5 N 1 viruses rarely infect and spread from human to human, although they can replicate efficiently in the lungs.

This is the first line of defense. It is the drug many countries are stockpiling, and the plan is to rely heavily on it.

only one case, and whether that condition was something unique we don't know.

We don't know how many more mutations are required. But at this point, we still have some time.

It is a mixture. Within the mixture we found virus that is highly, highly resistant. When you look at the virus as a whole, it is partially resistant.