That's out of more than 4.6 million fully vaccinated residents, according to state data. Chicago's top doctor said earlier this month that the city's rate of infection post-vaccination was low, with 0.06% of fully vaccinated people contracting the virus. "We've had more than 700,000 Chicagoans that are have a completed vaccine series - two weeks post their second dose, or two weeks post their first dose if they got J&J," Chicago Department of Public Health Commissioner Dr. Allison Arwady said last week. "And at this point we've identified fewer than 500 breakthrough cases so that's, you know, 0.06% of those who had a completed series."