Question

what happens if vaccine was not discovered​

Answer 1

One of the things that vaccines make possible is the eradication of disease. So far, we've eradicated one human disease, smallpox, and we are really close with polio. Polio is on its last legs now that we've cornered it in just a couple of final populations in the world. That's only possible through the use of vaccines and requires everybody to use them for the whole world to benefit.

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Answer 2

Answer:

That disease would spread quickly if vaccine was not discovered​

Explanation:

Consider a future where the measles vaccination isn't available. That sickness would swiftly spread. If you dumped measles immunity everywhere without a vaccination, you'd have massive outbreaks in which 80% (or more) of people became sick with the disease. They'd have high fevers and skin rashes. Many of them would be hospitalised, some would die, and some would be left with permanent afflictions such as blindness.

Imagine a social climate where such diseases are common, where individuals are terrified of coming into contact with others, and where parents prevent their children from playing with other children.