What historical figure developed a vaccine to prevent a deadly disease ?​

The development of vaccination as a public health tool is attributed to Edward Jenner and his experiments with coxpox in 1796 (figure 1), although the practice of variolation using 'wild' smallpox virus had been practiced in some countries for much longer [1].

Explanation:

answer: all of the above

a. apply ice to the affected area.

b. administer tylenol (acetaminophen).

c. put a gate across the stairs.

d. apply knee and elbow protectors.