Which of the following is an inactivated (killed) polio vaccine developed in 1952?

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Accepted Answer

Step 1: Recognize the vaccines

- Salk vaccine: the inactivated (killed) poliovirus vaccine (IPV) developed by Jonas Salk in the early 1950s (around $1952$) and brought into wide use after the 1954 field trials and 1955 licensing. It uses formalin-inactivated poliovirus.
- Imvanex: a modified vaccinia Ankara vaccine for smallpox/monkeypox, not polio.
- HDCV: human diploid cell rabies vaccine (inactivated rabies), not polio.
- TAB: typhoid-paratyphoid A & B vaccine (enteric disease), not polio.

Step 2: Conclusion

Only the Salk vaccine is the inactivated (killed) polio vaccine listed.

FINAL_ANSWER: a

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