Table 1.

Oral polio vaccines

Oral polio vaccine	Protection offered	Characteristics
tOPV	Serotypes 1, 2 and 3	Inexpensive, effective and offers long-lasting protection
bOPV	Serotypes 1 and 3	Stronger immune response against types 1 and 3 compared with tOPV. No immunity against serotype 2
mOPVs	Serotype 1 (mOPV type 1), serotype 2 (mOPV type 2) and serotype 3 (mOPV type 3)	Generate best immune response to the targeted serotype
nOPV2	Serotype 2	Genetically stable and less likely to be associated with the emergence of cVDPV2 in low-immunity settings

bOPV, bivalent oral polio vaccine; cVDPV2, circulating vaccine-derived poliovirus type 2; mOPV, monovalent oral polio vaccine; nOPV2, novel oral polio vaccine type 2; tOPV, trivalent oral polio vaccine.