Answer:
Receiving a vaccination
Explanation:
Vaccines contain weaker viruses/bacteria that are still strong enough to make antibodies and create memory cells. The immune system orders B cells to produce and release antibodies.
Swelling is usually caused by allergic reactions, side effects of vaccines or medications, or infections.
Muscle sprains are injuries and don't cause a person to produce antibodies.
Fevers are a sign that your body is fighting an infection and also don't cause people to produce antibodies.
