rBCG30 (recombinant Bacillus Calmette-Guérin 30) is a prospective vaccine against tuberculosis created by a team headed by Marcus A. Horwitz at UCLA. It is a live vaccine, consisting of BCG genetically modified to produce abundant amounts of a 30kDa antigen that has been shown to produce a strong immune response in animals and humans. The vaccine entered clinical trials in 2004, but has since been withdrawn because of poor in vivo and in vitro potency.