31. In Nigeria the wild poliovirus WPV is mainly prevalent in the north of the country. 32. Switch to a bivalent oral eradication of poliovirus type 2 was certified in September 2015. 33. Poliovirus is transmitted through the oral-fecal route and does not always cause symptoms.34. A small amount of poliovirus infections cause paralysis when the virus infects the nervous system. 35. Poliovirus , as well as coxsackie and echovirus are spread through the fecal-oral route.36. HIV and poliovirus are such viruses. 37. Low resolution structures of CD155 complexed with poliovirus have been obtained using x-ray crystallography. 38. CSF testing to date has been negative for West Nile virus and enteroviruses, including poliovirus . 39. One dose of OPV produces immunity to all three poliovirus serotypes in approximately 50 % of recipients. 40. This is important because countries with high incidence of polio are now using live oral poliovirus vaccine.
