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(Patty Wetli / WTTW News)

Chicago and Cook County last faced a low risk of COVID-19 on May 5. The region has bounced between a medium risk and a high risk all summer.

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This electron microscope image shows mature, oval-shaped monkeypox virions, left, and spherical immature virions, right, from a human skin sample associated with a 2003 prairie dog outbreak. (Cynthia S. Goldsmith, Russell Regnery / CDC)

A recent study from the CDC finds that in a sample of nearly 2,000 people who had monkeypox, 38% also had HIV infection and 41% had an STI in the preceding year. Those rates are much higher than the rates of HIV and STIs in the general population.

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 The Elkhorn River, just west of Omaha, Neb., is pictured on Thursday, Aug. 18, 2022. (AP Photo / Josh Funk)

People are usually infected when water containing the amoeba enters the body through the nose while swimming or diving into lakes and rivers. Other sources have been documented, including tainted tap water in a Houston-area city in 2020.

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This 1964 microscope image made available by the U.S. Centers for Disease Control and Prevention shows damage from the polio virus to human spinal cord tissue. (Dr. Karp / Emory University / CDC via AP, File)

Polio was once one of the nation’s most feared diseases, with annual outbreaks causing thousands of cases of paralysis. Its elimination in the U.S., officially declared in 1979, is considered one of the nation’s greatest public health victories.

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(Patty Wetli / WTTW News)

Chicago Department of Public Health officials continue to recommend that residents wear masks indoors and on public transportation to reduce their risk of contracting COVID-19 and ensure they are up to date with their COVID-19 vaccines.

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This electron microscope image shows mature, oval-shaped monkeypox virions, left, and spherical immature virions, right, from a human skin sample associated with a 2003 prairie dog outbreak. (Cynthia S. Goldsmith, Russell Regnery / CDC)

By declaring the state a disaster area for the disease, the Illinois Department of Public Health will be able to more quickly coordinate the agency’s response to the spread of the virus and distribute vaccines more efficiently, according to a statement from the governor’s office.

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Gov. J.B. Pritzker appears during a press conference on Friday, June 24, 2022. (WTTW News)

The governor is experiencing “mild symptoms” and has been prescribed Paxlovid, an antiviral medication used to treat the disease.

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(Patty Wetli / WTTW News)

Chicago Department of Public Health officials recommend that residents wear masks indoors and on public transportation to reduce their risk of contracting COVID-19 and ensure they are up to date with their COVID-19 vaccines.

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Dr. Rochelle Walensky, Director of the Centers for Disease Control and Prevention, testifies during a Senate Health, Education, Labor, and Pensions Committee hearing to examine an update on the ongoing Federal response to COVID-19, June 16, 2022, on Capitol Hill in Washington. (AP Photo / Manuel Balce Ceneta, File)

The new variants, labeled BA.4 and BA.5, are offshoots of the omicron strain that has been responsible for nearly all of the virus spread in the U.S. and are even more contagious than their predecessors.

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(Patty Wetli / WTTW News)

The threat of COVID-19 eased across Chicago and Cook County Thursday, as federal officials lowered the warning level to “medium” after two weeks at “high,” according to Centers for Disease Control data. However, Chicago Department of Public Health officials continue to recommend that residents wear masks indoors and on public transportation. 

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(Patty Wetli / WTTW News)

One week ago, federal officials lowered the risk warning level to high for Cook County. But even as confirmed cases of COVID-19 continued to drop, hospitalizations rose just enough across Cook County to trigger an increase in the warning level by federal officials.

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(Patty Wetli / WTTW News)

COVID-19 posed a high risk in Chicago and Cook County for 21 days, but neither state, county nor city officials imposed new restrictions designed to prevent the spread of COVID-19. Chicagoans should consider the CDC’s medium level of risk warning as “a yellow light of caution,” Dr. Allison Arwady has said.

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This electron microscope image shows mature, oval-shaped monkeypox virions, left, and spherical immature virions, right, from a human skin sample associated with a 2003 prairie dog outbreak. (Cynthia S. Goldsmith, Russell Regnery / CDC)

Nine cases of monkeypox have been detected in Chicago while one case has been identified in DuPage County, according to the Illinois Department of Public Health. 

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(Jan Kraus / Unsplash)

More than 200 people across the country, including 11 in Illinois, have become ill after coming in contact with poultry in backyard flocks, according to the Centers for Disease Control and Prevention.  

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(Patty Wetli / WTTW News)

Chicago officials will not immediately reimpose an indoor mask mandate because the city’s hospitals are not being strained by the number of people seriously sick with COVID-19.

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(valelopardo/ Pixabay)

Of the nine children under investigation for severe hepatitis, two-thirds tested positive for a common virus that causes cold or flu-like illness, according to the Illinois Department of Public Health.