Polio vaccines come in two main forms: inactivated polio vaccine (IPV) and oral polio vaccine (OPV). The type of OPV used has evolved over time.
Here's a breakdown:
Types of Polio Vaccines
| Vaccine Type | Poliovirus Types Protected Against | Status |
|---|---|---|
| Inactivated Polio Vaccine (IPV) | Types 1, 2, and 3 | Currently in use |
| Trivalent Oral Polio Vaccine (tOPV) | Types 1, 2, and 3 | No longer in use (since 2016) |
| Bivalent Oral Polio Vaccine (bOPV) | Types 1 and 3 | Currently in use |
As the provided reference indicates, there are different types of polio vaccines offering protection against varying strains of the poliovirus.
