age to get varicella booster vaccine
The annual rate of breakthrough varicella significantly increased with the time since vaccination, from 1.6 cases per 1000 person-years within 1 year after vaccination to 9.0 per 1000 person-years at 5 years and 58.2 per 1000 person-years at 9 years.. - Sandra Chavez, M.D. et al., New England Journal of Medicine. Among children vaccinated between ages one and 12 years, the annual rate of breakthrough varicella increased with time since vaccination even adjusting for the same exposure factors. The researchers reported: 1  1.6 cases per 1,000 person-years within the first year (95% CI 1.2 to 2.0). The academy recommends the first varicella dose be administered at age 12 to 15 months. However, Dr. Chaves and colleagues noted, No long-term data are available on the duration of immunity afforded by the second dose of vaccine.. The CDC recommendation that all American children get booster doses of chickenpox vaccine and all adults over 60 years old get a dose of shingles vaccine will generate billions of dollars for Merck, the sole supplier of chickenpox and shingles vaccine in the U.S. Our eldest is now 9 years old, and we did not know back in 1998 about the dangers of vaccinations. We allowed her to get all of her vaccinations, including chicken pox. Two years ago she got the worst case of chicken pox we have ever seen. My daughter had her chicken pox vaccine at 15 months. Within 3 weeks she had reverted back to crawling and could not stand up or walk on her own. Both things she was able to do at 11 months. She was diagnosed with Acute Cerebellar Ataxia-a direct result of her chicken pox vaccine. ATLANTA, March 14 -- Varicella vaccine efficacy drops dramatically over time, according to surveillance data that contributed to the CDC's decision last year to recommend a booster. As expected from previous studies, the incidence of varicella dropped overall by 85% from 1995 to 2003/2004 (2,794 versus 420 cases). With increasing coverage of the population, the proportion of cases that occurred in vaccinated children increased from 1% in 1996 to 60% in 2004. And what about the chicken pox vaccine's safety? In September 2000, the FDA reported that in the first three years of the vaccine's use, 1 in 33,000 doses was followed by shock, convulsions, encephalitis, thrombocytopenia or death. Children vaccinated five or more years prior had 2.60-fold higher odds of moderate-to-severe breakthrough varicella than those vaccinated less than five years prior (95% confidence interval 1.20 to 5.80, P =0.01) after adjustment for age at vaccination and calendar year.
Between ages one and 12 years