Correction for “ Tipping elements in the Earth System , ” by Hans

LETTER (ONLINE ONLY) Correction for “Parameters that influence the prediction of epidemiological benefits of more-effective tuberculosis vaccines, drugs, and diagnosis,” by Janakiraman Vani, Mohan S. Maddur, Sébastien Lacroix-Desmazes, Srini V. Kaveri, and Jagadeesh Bayry, which appeared in issue 46, November 17, 2009, of Proc Natl Acad Sci USA (106:E129; first published October 26, 2009; 10.1073/pnas.0911020106). The authors note that on page E129, right column, first full paragraph, second line, “One of the reports suggests that >80% of current smokers or ex-smokers are positive for tuberculin skin test as compared to <3% in nonsmokers (5)” should instead appear as “One of the reports suggests that >80% of current smokers or ex-smokers are positive for tuberculin skin test and this was significantly higher than for nonsmokers (5).”