I for certain do know that these vaccines are administered to the body to enable it be defended from infection for the time being as the body matures and manufactures its own defence mechanism through the anti bodies. However, continued use of anti biotics and other drugs makes the body system susceptible to attacks at a later stage of one's lifecycle and the reason being that one's body becomes used to these drugs meaning that even though these are administered continuously, the viruses in the body will act resistant.