Why does vaccine development take a long time? How can the vaccine / medicine not be done quickly at a time when technology has developed so much? What kind of processes or reasons does it progress slowly?
To summarize from the simplest, the immune system may vary depending on the conditions experienced by each person. For this reason, in order to avoid any bad probability, any test of the microbes to be given to the body by the vaccine should be tested without ignoring the slightest. From the body to body, from temperature to cold, and with many substances, it is possible that the microbes may mutate and get even worse results. Therefore, vaccination is long process with side effects.
