Shingles may be a Vaccines are biological products which are wont to prevent the occurrence of an outsized number of diseases. Vaccines protect against quite 25 debilitating or life-threatening diseases, including measles, polio, tetanus, diphtheria, meningitis, influenza, tetanus, typhoid and cervical cancer. Vaccines constitutes of a strain of disease-causing microorganism which is present within the sort of killed or weakened state. Vaccines are often classified on the idea of strain or serotype i.e. monovalent vaccines and multivalent vaccines. Vaccines could also be monovalent or multivalent. A monovalent vaccine contains one strain of one antigen (e.g. Measles vaccine), whereas a multivalent vaccine contains two or more strains/serotypes of an equivalent antigen (e.g. OPV).