Effectiveness of BCG Vaccination Against Mycobacterium tuberculosis Infection in Adults: A Cross-sectional Analysis of a UK-Based Cohort
AL Katelaris, C Jackson, J Southern… - The Journal of …, 2020 - academic.oup.com
The Journal of Infectious Diseases, 2020•academic.oup.com
Background BCG appears to reduce acquisition of Mycobacterium tuberculosis infection in
children, measured using interferon-gamma release assays (IGRAs). We explored whether
BCG vaccination continues to be associated with decreased prevalence of M. tuberculosis
infection in adults. Methods We conducted a cross-sectional analysis of data from adult
contacts of tuberculosis cases participating in a UK cohort study. Vaccine effectiveness (VE)
of BCG, ascertained based on presence of a scar or vaccination history, against latent …
children, measured using interferon-gamma release assays (IGRAs). We explored whether
BCG vaccination continues to be associated with decreased prevalence of M. tuberculosis
infection in adults. Methods We conducted a cross-sectional analysis of data from adult
contacts of tuberculosis cases participating in a UK cohort study. Vaccine effectiveness (VE)
of BCG, ascertained based on presence of a scar or vaccination history, against latent …
Background
BCG appears to reduce acquisition of Mycobacterium tuberculosis infection in children, measured using interferon-gamma release assays (IGRAs). We explored whether BCG vaccination continues to be associated with decreased prevalence of M. tuberculosis infection in adults.
Methods
We conducted a cross-sectional analysis of data from adult contacts of tuberculosis cases participating in a UK cohort study. Vaccine effectiveness (VE) of BCG, ascertained based on presence of a scar or vaccination history, against latent tuberculosis infection (LTBI), measured via IGRA, was assessed using multivariable logistic regression. The effects of age at BCG and time since vaccination were also explored.
Results
Of 3453 recent tuberculosis contacts, 27.5% had LTBI. There was strong evidence of an association between BCG and LTBI (adjusted odds ratio = 0.70; 95% confidence interval, .56–.87; P = .0017) yielding a VE of 30%. VE declined with time since vaccination but there was evidence that LTBI prevalence was lower amongst vaccinated individuals even >20 years after vaccination, compared with nonvaccinated participants.
Conclusions
BCG is associated with lower prevalence of LTBI in adult contacts of tuberculosis. These results contribute to growing evidence that suggests BCG may protect against M. tuberculosis infection as well as disease. This has implications for immunization programs, vaccine development, and tuberculosis control efforts worldwide.
Clinical trials registration
NCT01162265.
Oxford University Press