The term immunization is defined as a process by which an individual's immune system becomes fortified against an agent called as the immunogen. This happens when the system is exposed to molecules that are foreign to the body and it will further develop the ability to quickly respond to encounter that foreign body because of its immunological memory. Thus by this exposure to the immunogen in a controlled way that body can learn to protect itself and this process is called as active immunization. A general physician is a physician who provides both the first contact for a person with an undiagnosed health concern. There are many possible risks of vaccine side effects such as the risk of serious allergic reaction, severe types of complications and hospitalization or even to the extent of death from vaccine preventable disease. Vaccines undergo rigorous safety testing prior to being approved by the FDA and are continually monitored for safety. All vaccines are tested to be safe. They are also studied to be administered together so as to work in conjunction to safely prompt a child's immune system to build protection. Therefore the few reactions to immunizations are like swelling, redness and pain at the place of the injection and this begins within 24 hours of the shot and can last up to 2 or 3 days. Fever also is seen with most of the vaccines and also severe allergic reactions are also seen in rare cases.
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