These days, many communicable diseases are already preventable. This is made possible by worldwide vaccination campaigns that aim to decrease and limit the spread of these diseases.
Vaccines help the body develop immunity by mimicking a certain infection. This exposure to infection is just enough to trigger the body’s immune system to produce defensive white blood cells (T and B-lymphocytes) and antibodies. Once the mimicked infection is over, your body’s immune system already knows how to fight the same kind of disease in the future. This is how vaccines prevent a vaccinated individual from contracting the disease.
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