There are two types of vaccines against polio -- the inactivated polio vaccine, IPV (pioneered by Jonas Salk, and now available in an "enhanced potency" form, i.e., EP-IPV) and the live, oral polio vaccine, OPV (developed by Albert Sabin). Both vaccines are trivalent; that is, they both contain antigens of all three poliovirus serotypes (1,2, and 3).

Which vaccine(s) can prevent primary, gastrointestinal infection with poliovirus?