Most viruses are species specific and would have posed no threat to humans.

More alarming, he said, was mounting evidence that the virus posed a grave risk to a wide array of birds, including threatened species.

It is currently not considered as endangered, but the virus and the degradation of its habitat pose a serious threat to some populations.

In the past people were forced to stay in hospitals where viruses like hepatitis posed a serious a threat.

It's likely that the virus still poses a risk to pregnant women and infants.

The virus poses little danger to people, even if they eat the meat of infected animals.

But what risk the virus might pose to the 4.5 million Americans who receive blood transfusions every year is difficult to determine.

The virus poses a threat to the animals' conservation in zoos.

So far, this virus, like most others, is not widespread and poses little danger to the surfing public.

On several occasions, the general public has said that it does not understand the mass slaughter of animals when the virus poses no danger to humans.