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In medical terms, a booster dose is an extra administration of a vaccine after an earlier (prime) dose. After initial immunization, a booster injection or booster dose is a re-exposure to the immunizing antigen. It is intended to increase immunity against that antigen back to protective levels, after memory against that antigen has declined through time. For example, tetanus shot boosters are often recommended every 10 years, before which memory cells specific against tetanus have lost their function or undergone apoptosis.
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The usual vaccination schedule of Gynatren is 3 intramuscular injections of 0.5 ml vaccine at intervals of 2 weeks, followed by a booster dose of 0.5 ml 6–12 months after the first injection. The booster injection raises the serum antibody titres in most cases back to similar levels to those found shortly after primary vaccination and ensures renewed immune protection for about 2 further years. Grčić et al. recommends the periodic administration of booster doses every 2 years to maintain protective immunity for many years.
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The World Health Organization (WHO) recommends vaccinating against measles, mumps, rubella (German measles), and varicella (chickenpox) because the risks of these diseases far outweigh the risks of vaccinating against them. In particular, the World Health Organization recommends varicella vaccination in countries where the vaccine is affordable, the disease is a relatively important problem, and high and sustained vaccine coverage can be achieved. The United States and a few other countries have widely implemented this. MMR and varicella vaccine are given at roughly the same time and a booster injection is recommended for both.
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The agglutination titres were determined by preparing two-fold serial dilutions of the serum samples in isotonic saline (dilutions of 1:10 to 1:1280), using 0.5 ml concentrated lactobacillus vaccine as an agglutinogen. An at least threefold elevation of the agglutination titres following primary immunization was detected in the serum of 93.8% of patients; the rest of the patients were considered non-responders or poor responders to the vaccination. The geometric mean of the agglutination titres increased from the basal level of 1:56 before vaccination to 1:320 after finishing the primary immunization program, and it was still 1:140 one year later. Two weeks after the booster injection the mean titres were raised back to 1:343.
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