large number of variations are known. the interior of the shell is dull reddish with very faint spiral bands visible, white at the columella. operculum: the operculum is calcified at the inside (part attached to the snail). body: ?...
be updated. posted august , outbreak summary cdc is collaborating with public health officials in two states and the u.s. food and drug administration (fda) to investigate an outbreak of salmonella infections, serotype typhi. salmonella typhi is the bacterium that causes typhoid fever. typhoid fever...