essay on Polio
Polio runs rampant in countries with very unhealthy sewage practices. Luckily, polio can be isolated from sewage, but anytime unclean water is let into a river, stream, lake, or other water body, it can spread into any unknowing person who uses that water to drink. ... Polio after being digested, heads for the cells covering the intestines. There are three main strains of Polio. ... The third Polio strand is major poliomyelitis. ... Paralytic polio is a serious threat.