But the biggest crisis is India’s longstanding battle with tuberculosis. The country has as many as 2.7 million TB patients currently, by far the most in the world, and the disease kills an estimated 421,000 Indians each year. The current gap in care could lead to an additional 6.3 million cases and 1.4 million deaths from tuberculosis by 2025, according to a study by Zarir Udwadia, a pulmonologist at Mumbai’s P.D. Hinduja Hospital and Medical Research Centre.