Tetanus remains preventable. Bridging the adult booster gap may determine whether India can move from control to elimination of avoidable deaths. Experts highlight the importance of the Td vaccine in combating waning immunity against tetanus and diphtheria in adults. Tetanus and diphtheria are two preventable diseases. And still, they surface years after childhood vaccinations. As antibody levels decline over time, especially against diphtheria, could.