Which of the following statements is true? the first vaccine was developed for cowpox. before jenner's vaccine, there was no prevention for smallpox. travelers to other countries are often required to get special vaccinations. missed immunizations cannot be given at future doctor visits.

Travelers to other countries are often required to get special vaccinations.

Explanation:

where are the answers

explanation:

be cause we need them

hey.

the answer is. b) to protect migrating native american tribes .

and, c) to protect migrating native american tribes .

hope this , if it does, consider marking me brainiest! uwu