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.
In most cases, one or two doses of the chickenpox vaccine will provide ongoing immunity. It is common for schools and childcare institutions to require proof of vaccination or immunity to chickenpox prior to admittance. A simple varicella titer test can provide this information.This test may also be known as a chickenpox test, an immune to chickenpox test, or VZV. The varicella titer test (chickenpox) looks for the antibodies that indicate immunity as a result of clinical recovery or vaccination.n most cases, one or two doses of the chickenpox vaccine will provide ongoing immunity. It is common for schools and childcare institutions to require proof of vaccination or immunity to chickenpox prior to admittance. A simple varicella titer test can provide this information.