But they are not yet a major public health threat - and may never be.
AS public health threats go, they could not have been more different.
The greatest public health threat for many American women is the men they live with.
"But if there is a health threat, we'll obviously look forward to any help they can give us."
Following these steps can help you be better prepared for any type of public health threat.
But there was little in the reports to suggest a major public health threat, much less a new disease.
And in this case, the health threat is not merely a potential one.
There was no public health threat, the authority said in a statement.
But the finding increased concern among scientists about the potential health threat from the ground water.
The agency said many had become substantial environmental and public health threats.