vaccine

Vaccine Comes From The Latin word, ”Vacca.”

Introducing pathogens into the body of a healthy person can prevent even more serious illness.

This concept of vaccine and immunity already existed in China around 200 BC.

Ancient healers prevented smallpox by putting scab powder of smallpox in the patient’s nose.

In 1796, British doctor ”Edward Jenner” took this technology a step further.

A boy was vaccinated with cowpox, which is less harmful than smallpox.

And after the illness was cured, he was contacted with the smallpox virus.

But he did not get infected.

The word “vaccine” was coined by Jenner in the wake of this episode.

Because “vacca” means ”cow’ in Latin.

At that time, Jenner couldn’t understand why this happened, but posterity researchers have elucidated how immunity works.

A vaccine is to prepare for an external attack by working on the immune system.

When a vaccine made from a harmless virus is injected into the human body, white blood cell B cells and T cells are activated and ”memory cells” are created.

These cells continue to proliferate in the human body for decades.

So when you come across the same virus again, the white blood cells immediately destroy it.

Currently, the ”US Centers for Disease Control and Prevention” recommends all infants and children to be vaccinated with various vaccines.

Some of these vaccinations require only one injection, while others require multiple injections.

For example, diphtheria and tetanus vaccines require 5 doses in about 5 years.

A booster vaccination is required once every few years to activate the memory cells of the human body.

Therefore, adults also need to be vaccinated.

Viruses such as influenza mutate frequently, so different vaccines are needed each year.

When a vaccine made from a harmless virus is injected into the human body, white blood cell B cells and T cells are activated and ”memory cells” are created.

These cells continue to proliferate in the human body for decades.

So when you come across the same virus again, the white blood cells immediately destroy it.

Currently, the ”Centers for Disease Control and Prevention” recommends all infants and children to be vaccinated with various vaccines.

Some of these vaccinations require only one injection, while others require multiple injections.

For example, diphtheria and tetanus vaccines require 5 doses in about 5 years.

A booster vaccination is required once every few years to activate the memory cells of the human body.

Therefore, adults also need to be vaccinated.

Viruses such as influenza mutate frequently, so different vaccines are needed each year.

・References
https://tama.wtf/jp/science/covid-19/vaccine
WHO: Vaccines and immunization

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