Which vaccine is classified as a killed polio vaccine?

The Salk IPV, or Inactivated Polio Vaccine, is the correct answer because it is made from poliovirus that has been killed or inactivated, meaning it cannot cause disease. This vaccine stimulates the immune system to produce antibodies against the poliovirus without the risk of paralysis associated with live attenuated vaccines. The use of a killed virus in Salk IPV is significant because it allows for safe immunization, especially in populations with high susceptibility to poliovirus.

In contrast, the Sabin OPV (Oral Polio Vaccine) contains live attenuated virus and is administered orally, which can lead to rare cases of vaccine-derived poliovirus. While effective and easy to administer, it operates differently from the Salk IPV. The Pentavalent vaccine and HPV vaccine serve different purposes; the Pentavalent vaccine is a combination vaccine that protects against several infections, including diphtheria, tetanus, pertussis, hepatitis B, and Haemophilus influenzae type b, while the HPV vaccine is designed to prevent human papillomavirus infections, which are not related to polio. Therefore, the classification of the Salk IPV as a killed vaccine is what makes it the appropriate choice in this context.