21.   Polio is highly infectious.

22.   A Geneva-based spokesman for the U.N. World Health Organization said polio was on the decline in the region.

23.   Archana, an uneducated mother, brought her daughter for the vaccine even without knowing what polio is.

24.   Archana, an uneducated mother, brought her daughter for the vaccine without even knowing what polio is.

25.   Because polio is no longer an epidemic, post polio is viewed as a medical condition that will not occur in the future, he said.

26.   Caused by a virus, polio is a highly infectious disease that invades the nervous system and can cause total paralysis.

27.   If the program succeeds, polio would be the second virus to be wiped out by human efforts.

28.   If the plan developed by the World Health Organization succeeds, polio would be the second virus to be wiped out by human efforts.

29.   More upbeat, the report says that polio is on the verge of eradication in most of the world.

30.   Polio is a crippling and sometimes fatal disease that attacks the central nervous system.