A chromosome (from Greek: ÏÏá¿¶Î¼Î± color and Ïá¿¶Î¼Î± body) is a packaged and organized structure containing most of the DNA of a living organism.
Diphtheria, tetanus and pertussis are prevented by a childhood vaccine, called DTaP, and a newer vaccine for adolescents and adults, called Tdap.
Immunity against tetanus decreases with time and further booster shots may be needed. A course of tetanus-containing vaccine is recommended for anyone who has never been vaccinated. Immunisation may not be free of charge. Three doses are given at monthly intervals and two further booster doses are given 10 years apart.