Question

why preparation of covid-19 vaccine is time taken according to scientists of all over the world​

Answer 1

Answer:

$\huge\purple {\mathfrak{Bonjour Mate!}}$

During the discussion, George Yancopoulos, founder, president and chief scientific officer of Regeneron, said that most people don't realise that successfully inventing and developing any new drug or vaccine is quantifiably among the hardest things that human beings try to do.

The goal of a vaccine is to raise an immune response against a virus or a bacterium, the scientists said in the New York Times.

Answer 2

Answer:

Becoz now there are nearly 100+ vaccines undergoing testing

Explanation:

we should not use teh vaccine suddenly afters it's identification. we must test it on animals like rat,etc.. then only the vaccine is tested on human and is to be used