Chicago has highest COVID-19 case rates in city worker neighborhoods

The intrigue: These two ZIP codes carry two more distinctions:

• They house the city's highest concentrations of municipal workers.
• And they were the only two Chicago ZIP codes to post strong showings for former President Donald Trump in the 2020 election, per a Tribune analysis.

Why it matters: Chicago taxpayers help pay health care bills for most city workers. And it costs about $20,000 to treat the average unvaccinated COVID patient in the hospital, according to an analysis by the Kaiser Family Foundation.

• Vaccination rates in the two ZIP codes are relatively low at 53% (60655) and 54% (60656) — compared to more than 90% in four downtown ZIP codes.

Driving the news: At least two major city worker unions (police and firefighters/paramedics) officially oppose Mayor Lori Lightfoot's mandate for their members to be vaccinated.

• Of note: The Chicago Teachers Union supports the mayor's vaccine mandates.

The Chicago Department of Public Health declined to comment on the COVID-19 rates in these areas. But the high number of positive cases and low levels of vaccination may be attributable to higher levels of vaccine hesitancy among Trump voters.

What to watch: Lightfoot has given city workers until Oct. 15 to get fully vaccinated, prompting the head of the police union to tell the Sun-Times that thousands may simply say "screw you, I’m staying home."

• Expect a vaccine stand-off next month between Lightfoot and some city workers.

The big picture: Police unions from Los Angeles to New York City are pushing back against vaccine mandates. Some members of the Los Angeles police department have said they will request exemptions and have even filed a lawsuit in protest.