Vaccines work by mimicking a natural infection without causing disease. Because the body is now familiar with the infectious agent and knows how to fight it, the immune system is primed and ready when the real infection is encountered. First, the infectious agent must be separated and identified, and then work can begin on developing a vaccine. If the agent can not be isolated then vaccine development is virtually impossible.
There are three types of vaccines: live vaccines, inactivated vaccines, and synthetic vaccines. …
