â¢ Aged 50 and older who are at normal risk of developing colorectal. cancer; or. â¢ At high risk of developing colorectal cancer. âHigh risk for developing colorectal cancerâ is defined in the Code of Federal. NOTE: For coverage of screening colonoscopies, there is no age limitation.
Bd is a very important chytrid fungus because it appears to be capable of infecting most of the worldâs approximately 6,000 amphibian species and many of those species develop the disease chytridiomycosis which is linked to devastating population declines and species extinctions (Berger et al., 1998; Skerratt et al., 2007; Fisher et al., 2009).
Previous studies have shown that once Bd is introduced to a habitat, up to 50 percent of amphibian species and 80 percent of individuals may die within one year. The fungus has been studied for the past decade, yet scientists still do not know much about how Bd kills its host.