SCIENCE
VIRUS AND BACTERIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When everyone is vaccinated.
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A form of immunity that occurs when the vaccination of a significant portion of a population provides a measure of protection for individuals who have not developed immunity.
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When all of a group of farm animals have been immunised.
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When a disease spreads throughout a population.
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Detailed explanation-1: -Why is herd immunity important? Herd immunity occurs when a large portion of a community (the herd) becomes immune to a disease. The spread of disease from person to person becomes unlikely when herd immunity is achieved. As a result, the whole community becomes protected-not just those who are immune.
Detailed explanation-2: -Herd immunity is the indirect protection from a contagious infectious disease that happens when a population is immune either through vaccination or immunity developed through previous infection.
Detailed explanation-3: -For SARS-CoV-2, using an R0 value of 3 and vaccine efficacy equal to 100%, the calculation would be: [1-(1/3)] * (1/1)], thus, [1-(0.3)] * 1, i.e., [0.70] * 1, which would result in a proportion of 70% of the population required to attain herd immunity.
Detailed explanation-4: -We vaccinate the masses, causing herd immunity, to protect the relatively few who would otherwise become ill and suffer devastating consequences.