Subtitle: Types of Active Immunization
Active immunization is a process that stimulates the body’s natural immune system to produce antibodies to protect against a specific disease. This type of immunization is different from passive immunization, which involves the direct introduction of antibodies to the body. Active immunization can be achieved through a variety of methods.
Live-Attenuated Vaccines
Live-attenuated vaccines are composed of weakened live forms of the virus or bacteria that cause the disease. These vaccines are usually given by injection. Examples of live-attenuated vaccines include the measles, mumps, and rubella (MMR) vaccine and the varicella (chickenpox) vaccine.
Inactivated Vaccines
Inactivated vaccines, also known as killed vaccines, contain either a killed virus or bacteria. These vaccines are usually given by injection. Examples of inactivated vaccines include the influenza vaccine and the hepatitis A vaccine.
Toxoid Vaccines
Toxoid vaccines use a toxin, or poisonous substance, from the bacteria or virus that causes the disease. These toxins are weakened and used as vaccines. Examples of toxoid vaccines include the diphtheria and tetanus vaccines.
Subunit Vaccines
Subunit vaccines are composed of a specific part of the virus or bacteria that causes the disease. These parts are usually proteins. Examples of subunit vaccines include the hepatitis B vaccine and the human papillomavirus (HPV) vaccine.
Conjugate Vaccines
Conjugate vaccines are composed of a part of the virus or bacteria that causes the disease that has been joined, or conjugated, to another protein. The combination of these two substances helps to stimulate the body’s immune response. Examples of conjugate vaccines include the Haemophilus influenzae type b (Hib) vaccine and the pneumococcal conjugate vaccine.