Respuesta :

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As the popular saying goes, "prevention is better than cure". Doctors recommend flu shots each year to have prevention from flu. It is safe and effective. It gives beneficial to one's health, reduce absenteeism from classes (student), working people and less disruption in the provision of service. In return, it yields positive disposition to everyone who are practicing it.

Answer:

The flu virus changes every year.

Explanation:

The virus that causes the flu mutates rapidly. Each year, a different flu strain causes the flu, which explains why you need to get a new flu shot every year. The antibodies you produced in response to last year's flu shot won't protect you from this year's flu. It is difficult to keep up with a quickly evolving virus like the influenza virus.