The reason why one case of influenza does not confer lifelong immunity is that the virus tends to mutate overtime which makes it unrecognizable to the immune system.
<h3>Why is it difficult to get immunity to influenza?</h3>
Influenza is caused by a virus which tends to mutate overtime in order to stay ahead of medical technology.
As a result, this mutation makes the original virus unrecognizable to the immune system which would then be unable to fight it.
Find out more on natural immunity at brainly.com/question/21480961
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Answer:
It is weather
Explanation:
Climate describes something like "In Arizona it's usually dry and warm" While weather describes something like "In Michigan, there'll be a blizzard"
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Answer:
Traditional economy
Explanation:
The type of economy are the basic economic questions, "what goods to produce and how to produce them decided based on customs passed down from previous generations" is known as Traditional economy.
Traditional economy is an economic system in which traditions, customs, and beliefs help formulate the products and services that are produced by the economy, as well as the rules and manner of their distribution. Rural and farm based countries tend to use this kind of economic systems.
