Characterization of an intracellular ATP assay for evaluating the viability of live attenuated mycobacterial vaccine preparations

Kristopher Kolibab, Steven C. Derrick, William R. Jacobs, Sheldon L. Morris

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The viability of BCG vaccine has traditionally been monitored using a colony-forming unit (CFU) assay. Despite its widespread use, results from the CFU assay can be highly variable because of the characteristic clumping of mycobacteria, their requirement for complex growth media, and the three week incubation period needed to cultivate slow-growing mycobacteria. In this study, we evaluated whether an ATP luminescence assay (which measures intracellular ATP content) could be used to rapidly estimate the viability of lyophilized and/or frozen preparations of six different BCG vaccine preparations - Danish, Tokyo, Russia, Brazil, Tice, and Pasteur - and two live attenuated mycobacterial vaccine candidates - a δlysAδpanCD M. tuberculosis strain and a δmmaA4 BCG vaccine mutant. For every vaccine tested, a significant correlation was observed between intracellular ATP concentrations and the number of viable attenuated bacilli. However, the extractable intracellular ATP levels detected per cell among the different live vaccines varied suggesting that validated ATP luminescence assays with specific appropriate standards must be developed for each individual live attenuated vaccine preparation. Overall, these data indicate that the ATP luminescence assay is a rapid, sensitive, and reliable alternative method for quantifying the viability of varying live attenuated mycobacterial vaccine preparations.

Original languageEnglish (US)
Pages (from-to)245-249
Number of pages5
JournalJournal of Microbiological Methods
Volume90
Issue number3
DOIs
StatePublished - Sep 1 2012

Keywords

  • ATP assay
  • Attenuated live vaccines
  • BCG vaccine
  • Tuberculosis
  • Viability

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Microbiology (medical)

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