Explore how widespread immunity reduces transmission and protects susceptible or unvaccinated people, using vaccination and disease-distribution evidence in IB Biology HL C3.2.17.
A vaccine against meningitis A, a deadly bacterial disease, has eradicated the disease in 16 African countries since 2010. However, meningitis A still exists in those countries where people are unvaccinated.
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What are the possible aims of epidemiological research such as this?
Test vaccine effectiveness
Identify distribution of disease
Identify cause of disease
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A