What idea is expressed in the first paragraph? preface to leaves of gras?
1 answer:
The one when u die and the foodm stoore
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I believe the answer is D
Answer:
answer is D!!!!!!!!!!!
Explanation:
Answer:
Jonas Salk
Explanation:
- The vaccine that is used for the prevention of polio caused due to the infection caused by the poliovirus is known as polio vaccines.
- The first successful polio vaccine was developed by Jonas Salk in the year 1952 and the success of the field trials was announced in the year 1955.
- This vaccine became famous as the Salk polio vaccine which is 60-70% effective against PV1 and 90% against PV2 and PV3.
- This vaccine was an inactivated vaccine.
