PTE AcademicReading
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Word Bank
Herd Immunity
public healthWhen a large enough share of a population is immune to an infectious disease, the disease cannot (1) easily from person to person. This effect, known as herd immunity, (2) people who cannot be vaccinated, such as newborn babies. The share needed depends on how (3) the disease is: for highly infectious illnesses such as measles, the vast majority of people must be immune before the whole community is (4).