Others have found similar strains only in repeated samples from the same individual.

The virus was also found in samples of Australian honey bees.

Many of them are found in environmental samples, such as waste water or soil.

Evidence can also be found in samples of petrified palmwood.

Large numbers of metallic fragments have been found in samples taken from within the crater area.

Some scientists found little or no tetrodotoxin in samples provided by Davis.

A more recent study, in 2006, found an infection rate of 23% in samples submitted from all 48 states.

The Health Department takes similar action if two readings of 15 or greater are found in samples taken 90 days apart.

It also has been found occasionally in samples of groups who neighbor the aforementioned populations.