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TYPES OF VACCINES CURRENTLY USED FOR HUMANS

TYPES OF VACCINES CURRENTLY USED FOR HUMANS - TYPES OF...

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TYPES OF VACCINES CURRENTLY USED FOR HUMANS   A safe and effective vaccine stimulates the formation of memory B and T cells without causing the actual disease.   1. A TTENUATED   WHOLE - AGENT   VACCINES —entire microbes which are alive but have been weakened or  changed in some way so that they can no longer cause the disease but can still provoke an  immune response. These vaccines are generally very effective and often provide lifelong  protection. The organisms used often originate from mutations in long-term cultures or may have  been treated in some way to weaken them. Examples: Sabin polio vaccine, vaccines against  measles, mumps, and rubella (MMR). Rarely, the organisms in this type of vaccine can revert to  virulence (back-mutate) and cause the disease.    2. I NACTIVATED   WHOLE - AGENT   VACCINES ---microbes have been killed, usually by formalin or phenol.  May not be as effective as the vaccines that contain living organisms. Examples: human rabies 
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