Antibodies that people make to fight the new coronavirus last for at least four months after diagnosis and do not fade quickly, as some earlier reports suggested, scientists have found.

Visitors to Chicago from Hawaii, Nebraska and North Carolina will be required to quarantine for two weeks starting Friday, city officials announced Tuesday. Indiana is also on the verge of being added to the quarantine order that includes 21 states and Puerto Rico.

City officials shut down five restaurants and clubs for violating rules designed to slow the spread of the coronavirus, officials said Tuesday.

As summer nears its end, Chicago is seeing COVID-19 cases rise, and suburban Cook County is showing warning signs of increased risk of transmission of the virus, according to state officials. We check in with Chicago Department Public Health Commissioner Dr. Allison Arwady.

Monday is Overdose Awareness Day, an annual event aimed at reducing drug-related deaths and the stigma of substance use disorders. And it comes this year amid a dramatic spike in opioid-related overdoses and deaths in Chicago.

Those whose deaths were reported Sunday ranged in age from their 30s to their 80s, according to the Illinois Department of Public Health. They were residents of Cook, Bureau, Lake and Madison counties.

State health officials on Friday reported another 10 counties, including suburban Cook, are showing warning signs of increased risk for COVID-19. And on Saturday, the state passed a grim milestone: more than 8,000 virus-related deaths.

As more and more schools and businesses around the country get the OK to reopen, college towns are moving in the opposite direction because of too much partying and too many COVID-19 infections among students.

Chicago health officials will continue to recommend that anyone exposed to someone diagnosed with the coronavirus be tested for COVID-19, despite new guidance from the CDC that ignited a firestorm of controversy.

Eight Cook County residents were among the 24 deaths reported by Illinois health officials Thursday as the state nears 8,000 virus-related deaths and more than 227,000 cases of COVID-19.

The Illinois Department of Public Health reported 2,157 new confirmed cases of COVID-19 on Wednesday and another 37 virus-related deaths — including a teenage girl from Cook County.

City officials on Tuesday announced changes to Chicago’s quarantine order. Starting Friday, 18 states and Puerto Rico will be on the list.

Starting Wednesday, people visiting bars and restaurants in Illinois will be required to wear face coverings during all of their interactions with staff, whether they are sitting indoors or outdoors, according to a new policy.

A handful of Chicago residents became the first in the city to participate in a national clinical trial to test a potential COVID-19 vaccine as the University of Illinois at Chicago launched its study on Monday.

After expressing frustration at the slow pace of approval for coronavirus treatments, President Donald Trump announced Sunday the emergency authorization of convalescent plasma for COVID-19 patients.

State health officials reported nearly 1,900 new cases of COVID-19 on Sunday and another six virus-related deaths — five of them among Cook County residents, including a woman and man in their 40s.