Cellular fractions Some vaccines are prepared from fractions of the cell. The meningococcal vaccine is produced from the polysaccharide antigen on the cell wall. These vaccines are safe and effective but for a limited duration. This is a mix of two or more types of vaccines. This enables easier administration, reduces cost and avoids repeated contact with the patient.
Some vaccines combine two strains of the same species.
Polio and influenza vaccines are prepared this way. Immunoglobulins Immunoglobulins are specific protein substances that are produced by certain cells in the body to help in fighting infection. They are also referred to as antibodies and are a vital part of the body's defence mechanism. These are classified based upon the speed with which they are formed in response to the infection, as well as their mechanism and site of action. The body also retains in its memory the template of the disease-causing organism so that the next time it attacks, the antibodies are quick to counter any threat to the body and the person does not develop the disease.