A vaccine is a product that produces immunity from a disease and can be administered through needle injections, by mouth, or by aerosol. A vaccination is the injection of a killed or weakened organism that produces immunity in the body against that organism. A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism, and is often made from weakened or killed forms of the microbe, its toxins or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as foreign, destroy it, and "remember" it, so that the immune system can more easily recognize and destroy any of these microorganisms that it later encounters. Inoculation is a method of purposefully infecting a person with an organism in a controlled manner so as to minimise the severity of the infection and also to induce immunity against further infection. An influenza vaccine is needed every season for two reasons. First, the body's immune response from vaccination declines over time, so an annual vaccine is needed for optimal protection. The Neonatologist or the child specialist will provide all the information required for the vaccines for the infants to the parents along with the time period for the various vaccines. In addition to these compulsory vaccinations, if parents want so, children may be protected and vaccinated also by the vaccine against pneumonia streptococcus and against varicella (chickenpox).