What are vaccines ? Give an example of their working . List any two diseases against which vaccines are available . (3 Points)
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Vaccines help protect against many diseases that used to be much more common. Examples include tetanus, diphtheria, mumps, measles, pertussis (whooping cough), meningitis, and polio. Many of these infections can cause serious or life-threatening illnesses and may lead to life- long health problems.
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