Biggest Health Worry After Katrina Is Clean Water

WASHINGTON (Reuters) - A lack of clean water is the most immediate health threat posed by the murky green water flooding Louisiana and Mississippi, health experts warned on Wednesday as authorities declared a public health emergency after Hurricane Katrina's devastation.

Threats include:

Viruses such a hepatitis A

Bacteria such as Vibrio cholera, which causes cholera, enterococci and dangerous strains of E. coli.