| the use of rectal tubes for stool collection. | besides verifying the absence of wild poliovirus transmission in children with acute flaccid paralysis, the iccpe also advocates verifying the absence of wild poliovirus transmission in the environment. this can be done either by community stool surveys of normal children or by sampling sewage. in developed countries, the sampling of sewage tends not be a constraint since adequate sewage systems exist. in developing countries where such systems do not always exist, or, if they do, they do not ... | 1992 | 12285226 |