Several Chicago aldermen are calling for the city to mandate proof of vaccination for people visiting public indoor settings, a move already adopted in other cities like New York. The aldermen said they were writing in support of Chicago requiring proof of COVID-19 vaccination “for persons visiting public indoor settings like restaurants, bars, movie theaters, gyms and concert halls,” according to a copy of the letter sent Thursday. New York City, New Orleans, San Francisco and Puerto Rico have issued such requirements, they noted.