In its most highly pathogenic form, influenza in chickens and turkeys produces a sudden appearance of severe symptoms and almost 100% mortality within two days.

In the present outbreaks, however, asymptomatic domestic ducks can directly introduce the virus, in its highly pathogenic form, to poultry flocks.

Researchers have been led to suspect non-plaque βA oligomers (aggregates of many monomers) as the primary pathogenic form of βA.

Moreover, viable non-culturable but pathogenic forms of legionellae can occur in water systems.

The pathogenic form of Pseudomonas luteola is a saprophyte.

Proteins that are degraded by chaperone-assisted selective autophagy include pathogenic forms of the Huntingtin protein, which cause Huntington's disease.

Candida in its pathogenic hyphal form is occasionally seen in biopsies of idiopathic leukoplakia.

It has also been used to study the structure of Plasmodium falciparum, a particularly pathogenic form of malaria.

I now turn to the issue of the low pathogenic form.

Most avian flu viruses are classified as low There have been three outbreaks in the United States of the highly pathogenic form, in 1924, 1983 and 2004.