The article "Why our flu vaccines can't keep up" mentions the concept of herd immunity. Look up what this is. Which of the following populations would be expected to exhibit herd immunity? O A population in which no one is vaccinated against the virus. O A population in which 25% of the people are vaccinated against the virus. O A population in which 50% of the people are vaccinated against the virus. O A population in which 90% of the people are vaccinated against the virus.
Herd immunity is also known as 'population immunity' or 'community immunity'.
Herd immunity occurs when a high percentage of a population /community has become immune to a specific disease. By this, the spread of the disease can be controlled and the whole community will be protected from the disease.
It can be achieved through vaccination or infection. Vaccination is the safest method to achieve herd immunity, because it does not allowing the spread of disease.
Natural infection develops antibodies in a recovered person against its reinfection, so it can create herd immunity. But the large number of infection causes more serious spread of disease and deaths.
So vaccination is the safe method to achieve herd immunity and 90% or more than 90% of the population should be vaccinated to achieve herd immunity against a highly contagious disease.
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