Multiple choice

Vaccines:

  1. Lead to autism

  2. are weak pathogens introduced and your body remembers later

  3. are 100% effective

  4. effective against polio, measles, chicken pox and tetanus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Vaccines work by introducing a weakened or inactivated form of a pathogen to the immune system. This allows the body to develop memory cells, which provide protection if the actual pathogen is encountered later.

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