VARIVAX [Varicella Virus Vaccine Live (Oka/Merck)] is a preparation of the Oka/Merck strain of live, attenuated varicella virus. The virus was initially obtained from a child with natural varicella, then introduced into human embryonic lung cell cultures, adapted to and propagated in embryonic guinea pig cell cultures and finally propagated in human diploid cell cultures (WI-38). Further passage of the virus for varicella vaccine was performed at Merck Research Laboratories (MRL) in human diploid cell cultures (MRC-5) that were free of adventitious agents. This live, attenuated varicella vaccine is a lyophilized preparation containing sucrose, phosphate, glutamate, and processed gelatin as stabilizers.
VARIVAX is indicated for vaccination against varicella in individuals 12 months of age and older.
The duration of protection of VARIVAX is unknown at present and the need for booster doses is not defined. However, a boost in antibody levels has been observed in vaccinees following exposure to natural varicella as well as following a booster dose of VARIVAX administered four to six years postvaccination.
In a highly vaccinated population, immunity for some individuals may wane due to lack of exposure to natural varicella as a result of shifting epidemiology. Post-marketing surveillance studies are ongoing to evaluate the need and timing for booster vaccination.
Vaccination with VARIVAX may not result in protection of all healthy, susceptible children, adolescents, and adults (see CLINICAL PHARMACOLOGY).
Published Studies Related to Varivax (Varicella Vaccine)
Varicella-zoster virus-specific antibody responses in 50-59-year-old recipients
of zoster vaccine. 
Prevaccination and 6-week postvaccination samples from the immunogenicity
substudy (n = 2269) of the zoster vaccine (ZV) efficacy trial (N = 22 439) in
50-59-year-old subjects were examined for varicella-zoster virus-specific
antibody responses to vaccination...
Immunogenicity and safety of combined measles-mumps-rubella-varicella vaccine
using new measles and rubella working seeds in healthy children in Taiwan and
Singapore: a phase II, randomized, double-blind trial. 
seed virus stock, in Taiwanese and Singaporean children (NCT00892775)... CONCLUSION: The immune responses elicited by the MMRV(new WS) vaccine were
Immunogenicity and safety of a measles-mumps-rubella-varicella vaccine following a 4-week or a 12-month interval between two doses. [2011.05.17]
BACKGROUND: The MMRV combination vaccine, Priorix-Tetra, is currently licensed in several European countries using a two-dose schedule in infants aged >/=9 months, with a preferred 6-week to 3-month interval between doses. This study was undertaken to generate safety and immunogenicity data for two doses of MMRV vaccine administered according to dose schedules using the shortest permitted interval of 4 weeks versus a longer interval of 12 months, which would allow flexible adaptation to local immunization calendars... CONCLUSIONS: Two doses of MMRV vaccine administered in the second year of life elicited adequate immunogenicity and were well-tolerated whether administered with a dose interval of 4 weeks or 12 months. Copyright (c) 2011. Published by Elsevier Ltd.
Effectiveness of 2 doses of varicella vaccine in children. [2011.02.01]
BACKGROUND: Because of ongoing outbreaks of varicella, a second dose of varicella vaccine was added to the routine immunization schedule for children in June 2006 by the Centers for Disease Control and Prevention... CONCLUSION: The effectiveness of 2 doses of varicella vaccine in the first 2.5 years after recommendation of a routine second dose of the vaccine for children is excellent. Odds of developing varicella were 95% lower for children who received 2 doses compared with 1 dose of varicella vaccine.
Varicella-related hospitalizations in the United States, 2000-2006: the 1-dose varicella vaccination era. [2011.02]
OBJECTIVE: To describe the effect of the mature 1-dose varicella vaccination program on varicella morbidity, we analyzed 2 national databases for varicella-related hospitalizations in the United States since implementation of the varicella vaccination program in 1995... CONCLUSIONS: Varicella-related hospitalization numbers and rates declined significantly during the 1-dose varicella vaccination era. Assuming declines in varicella-related hospitalizations are due, mainly, to the routine childhood varicella vaccination program, these data suggest that varicella vaccination prevented approximately 50,000 varicella-related hospitalizations in the United States from 2000 to 2006.
Clinical Trials Related to Varivax (Varicella Vaccine)
Persistence of Varicella Immunity in Hospital Employees Receiving Varicella Vaccine [Recruiting]
The purpose of the study is to learn more abou how the immune system responds to the
chickenpox vaccine in adults who had never had chickenpox as a child and were then
vaccinated as an adult. The study aims to learn more about the strength and duration of the
protection provided by the vaccine in adults, and to observe the immune response to an
additional dose of chickenpox vaccine in adults who had received the vaccine at least 5
years earlier. This is especially relevant to workers in a hospital who may be exposed to
The Safety, Immunogenicity and Immune Effect Research of the Varicella Vaccine After the 2nd Dose Vaccination [Enrolling by invitation]
To investigate the safety, immunogenicity and immune effect of the Varicella vaccine after
the 2nd dose vaccination in Chao yang district, Bei jing, since the 2nd varicella
vaccination was promoted by Beijing Center for Disease Control and Prevention in November,
Study on Effectiveness of 2-dose Live Attenuated Varicella Vaccine [Enrolling by invitation]
The objective of the study is as follows:
1. To know the antibody level during different interval after received 1 dose varicella
2. To know safety and effectiveness of received 2 doses varicella vaccine with different
3. To know safety and effectiveness of received varicella vaccine and MMR at the same
To achieve that, this study selects children with specific varicella vaccine history, gives
1 or 2 doses varicella vaccine, collects blood specimens and makes a follow-up visit after
All blood specimens will be tested by a third-party detection institution.
Immunogenicity and Safety Study of 2 Doses of Live Attenuated Varicella Vaccine [Completed]
Immune Persistence After Inoculated With One-dose Freeze-Dried Live Attenuated Varicella Vaccine in Children Vaccine in Children [Active, not recruiting]
Page last updated: 2014-11-30