Higher Covid vaccination may be why Delhi doing better than Mumbai As on July 23, Mumbai had 10,608 active Covid-19 cases while Delhi had only 573 coronavirus patients under treatment in hospitals or under home isolation, which is 178% less. Share Via Email | A+A A- A health worker prepares to administer the Covishield vaccine to a woman at a government hospital in Noida. (Photo | AP) NEW DELHI: The two most populous cities in India, Mumbai and Delhi, followed almost similar Covid-19 trajectories when the devastating second wave caught the country unawares, but the following weeks in these cities have thrown an epidemiological mystery with more questions than answers.