Vaccines Always Work. True or False

question 45

Multiple Choice

Vaccines always work. True or false?

• A) False. Sometimes memory cells are not produced.
• B) True. They always work to some degree.
• C) False. Some pathogens change so fast that memory cells for an earlier infection won't recognize the same pathogen in a subsequent infection.
• D) True. We've eliminated many diseases using them.
• E) False. Sometimes scientists don't make them correctly.

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