No, adults with a prior history of chickenpox do not need varicella vaccination.
Adults who have already had chickenpox are considered immune to varicella and do not require vaccination. A documented history of chickenpox is accepted as evidence of immunity and exempts individuals from vaccination requirements 1.
Evidence of Immunity
According to ACIP guidelines, the following constitute evidence of varicella immunity 1:
- Documented history of varicella disease (chickenpox)
- Laboratory evidence of immunity or laboratory confirmation of disease
- Birth in the United States before 1980 (except for healthcare personnel, pregnant women, and immunocompromised persons)
- Documentation of two doses of varicella vaccine
Who Actually Needs Vaccination
The guidelines are clear that vaccination is indicated only for persons without evidence of varicella immunity 1. For adults aged >13 years who lack immunity, two 0.5-mL doses of single-antigen varicella vaccine should be administered subcutaneously 4-8 weeks apart.
Important Caveats
Healthcare Personnel Exception
Birth before 1980 is not considered evidence of immunity for healthcare workers due to the risk of nosocomial transmission to high-risk patients 1. However, even for healthcare personnel, a verified positive history of varicella disease is accepted as evidence of immunity 1.
Bone Marrow Transplant Recipients
This is the one notable exception: persons who receive bone-marrow transplants should be considered non-immune regardless of previous varicella history or vaccination, as the association between donor immunity and recipient susceptibility has not been adequately studied 1.
Clinical Validation
Research confirms that a positive varicella history has a 98.5% positive predictive value for immunity 2, making it a highly reliable indicator that vaccination is unnecessary. Both healthy and immunocompromised individuals with verified positive histories of varicella may be considered immune 1.
Practical Approach
For adults presenting with a history of chickenpox:
- Accept the history as evidence of immunity - no further testing or vaccination needed
- Exception: If the patient is a healthcare worker, pregnant woman, or immunocompromised, consider serologic testing if there is any uncertainty about the history
- Exception: Bone marrow transplant recipients require re-evaluation regardless of prior history
The evidence consistently supports that natural varicella infection provides lifelong immunity, making additional vaccination both unnecessary and not cost-effective in this population 3.