Multiple choice

Active immunity is obtained by

  1. antibodies

  2. weakened germs infection

  3. natural resistance

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Active immunity results when exposure to a diseased organism triggers the immune system to produce antibodies to that disease. Exposure to the diseased organism can occur through infection with the actual disease (resulting in natural immunity) or introduction of a killed or weakened form of the diseased organism through vaccination (vaccine-induced immunity).

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