An operational definition is a clear, concise, detailed definition of a measure. You need operational definitions when collecting all types of data. It is particularly important when a decision is being made about whether something is defective or not defective or whether a defect exists or not.
The varicella vaccine protects against chickenpox (varicella), a common and very contagious childhood viral illness. The varicella vaccine is given by injection when kids are between 12 and 15 months old. They receive a booster shot for further protection at 4 to 6 years of age. Kids who are older than 6 but younger than 13 who have not had chickenpox also may receive the vaccine, with the two doses given at least 3 months apart. Kids 13 years or older who have not had either chickenpox or the vaccine need two vaccine doses at least 1 month apart.
The HPV vaccination: doses and timings. The HPV vaccine is given as an injection into the muscle of the upper arm. The vaccination consists of two doses and both injections are needed to ensure your daughter is fully protected against the virus. Girls given the HPV vaccine as part of the national vaccination programme receive a vaccine called Gardasil. The schedule for Gardasil is as follows: the first dose is given, usually in October of year 8 at school. the second dose is given no sooner than six months and no later than 24 months after the first dose.