There are several types of vaccines. Each type is designed to teach your immune system how to fight certain types of germs and the serious illnesses they cause. When scientists create vaccines, they consider: How your immune system responds to the germ Who should be vaccinated against the germ The best technology or approach for creating the vaccine Depending on a number of these factors, scientists decide which type of vaccine that they are going to manufacture. There are 4 main types of vaccines: Say no to plagiarism. Get a tailor-made essay on 'Why violent video games should not be banned'?Get the original essayLive attenuated vaccinesInactivated vaccinesSubunit, recombinant, polysaccharide and conjugate vaccinesToxoid vaccinesLive attenuated vaccinesLive vaccines use a weakened (or attenuated) form of the germ that causes disease. Because these vaccines are so similar to the natural infection they help prevent, they create a strong, long-lasting immune response. Just one or two doses of most live vaccines can give you lifelong protection against a germ and the disease it causes. But live vaccines also have certain limitations. For example: Because they contain a small amount of weakened live virus, some people should talk to their health care provider before receiving them, such as people with weakened immune systems, who have long-term health problems or who have had an organ. graft. They need to be kept cool, so they don't travel well. This means they cannot be used in countries where access to refrigerators is limited. Live vaccines are used to protect against: Measles, mumps, rubella (MMR combination vaccine) Rotavirus Smallpox Smallpox Yellow fever Shingles Inactivated vaccines Inactivated vaccines use the killed version of the germ that causes disease. Inactivated vaccines generally do not provide as strong immunity (protection) as live vaccines. So you may need several doses over time (booster shots) in order to get continued immunity against disease. Inactivated vaccines are used to protect against: Hepatitis AF (injection only) Polio (injection only) Rabies Subunit, recombinant, polysaccharide and conjugate vaccines Subunit, Recombinant, polysaccharide and conjugate vaccines use specific pieces of the germ, such as its protein, its sugar or its capsid (an envelope around the germ). Because these vaccines only use specific fragments of the germ, they provoke a very strong immune response that targets key parts of the germ. They can also be used on almost anyone who needs them, including people with weakened immune systems and long-term health problems. One limitation of these vaccines is that you may need booster shots to get continued protection against disease. These vaccines are used to protect against: Hib disease (Haemophilus influenzae type b) Hepatitis BHPV (human papillomavirus) Whooping cough (part of the DTaP combination vaccine) Pneumococcal diseaseMeningococcal Toxoid vaccines Toxoid vaccines use a toxin (harmful product) made by the germ that causes disease. They create immunity against the parts of the germ that cause disease rather than the germ itself. This means that the immune response targets the toxin rather than the germ as a whole. Like some other types of vaccines, you may need booster shots to get continued protection against disease. Keep in mind.