There are various types of vaccines:
Live Attenuated vaccines
These are produced by altering a disease-producing virus or bacteria in a laboratory. This altered vaccine organism replicates itself and provides immunity to the organism on which it is applied.
These contain either the whole bacteria or virus or fractions of both. The vaccines are either protein-based or polysaccharide-based. The protein-based consists of toxoids and subunit or subvirion products. The polysaccharide-based vaccines are composed of pure cell wall polysaccharide from bacteria.
These are a unique type of inactivated subunit vaccine which has long chains of sugar molecules that make up the surface capsule of certain bacteria. These vaccines are available in pneumococcal disease, meningococcal disease, and Salmonella Typhi.
The vaccine antigens which are produced by genetic engineering technology are termed as recombinant vaccines.
1. What are the risks of vaccinating ?
Vaccines are prepared to provide an additional strength to immunity for fighting any foreign bodies entering the body that cause diseases. Some of these vaccines cause a temporary headache, fatigue, or loss of appetite. In a few cases, children might experience a severe allergic reaction or a neurological side effect like seizure. Side effect which leads to death by vaccine is very low.
2. How are vaccines classified ?
The vaccines are classified generally as live or inactivated. These contain antigen which has the weakened or killed form of the disease-causing organism or fragments of the organism. The body responds according to the shapes of these antigens, and those are very specific.
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