NEW DELHI, Nov 17 (Reuters) - Indian states are sitting on more than 200 million doses of COVID-19 vaccines due to a reluctance among people to get inoculated, the chief executive of top vaccine maker the Serum Institute of India (SII) said on Wednesday. "The vaccine industry has worked tirelessly to provide enough stocks for the nation," SII CEO Adar Poonawalla said on Twitter, as his family-owned company prepares to resume exports to the COVAX international vaccine sharing program for the first time since April. read more"Today there are over 200 million doses available with states. I urge all adults to get vaccinated as soon as possible. Vaccine hesitancy is now the greatest threat in overcoming this pandemic," he said. A version of the AstraZeneca (AZN.L) vaccine produced by SII accounts for nearly 90% of the 1.24 billion doses administered in India.India has reported about 34.5 million infections, the most after the United States, and more than 464,000 deaths.