"They are going to be fodder for the virus," said Dr. Richard Novak, head of infectious diseases at UI Health. "The virus will infect them, it will mutate in them and the new variants will come from them and we'll all be at risk."
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According to the latest ABC News/Washington Post Poll, three in 10 adults said they have not gotten a coronavirus vaccine, and definitely or probably will not get one.
RELATED: How many people in your area are hesitant to get the COVID-19 vaccine?
Of this group, 73% believe U.S. officials are exaggerating the risk of the delta variant and 79% think they have little or no risk of getting sick.
WATCH: White House briefing says 70% of Americans 30 or older have gotten a COVID-19 vaccine
70% of Americans 30 or older have gotten COVID-19 vaccine
"It's almost heartbreaking that now the two populations that need this, the most are urban minority patients and rural white patients, are the ones that are saying no in the loudest numbers," said Dr. Mark Loafman, with the Cook County Health Department. "That group of patients that were able to hear facts and be reassured, we got to them. It's this group that the facts aren't going to fix it for them."
With nearly 70% of the eligible population vaccinated in Illinois, demand has slowed down to a trickle. At Cook County's mass vaccination sites Monday, free hot dogs were offered to those getting their shots.
"It's been long enough," said Christina Brown, who got her first shot Monday. :I started seeing results. Everybody was doing it. I wasn't hearing nobody having that bad of side effects. I said alright I'll go get it, and see what happens."
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However, there are still others who feel their freedom to choose was taken away.
"I felt like I was forced into it. I had to have surgery and my doctor basically told me that in order for me to get the surgery I literally had to get the shot. So this is my only reason to get the shot," said 23-year-old Tamarianna Tate. "Otherwise, I wouldn't. I wouldn't. I'm was a strong believer in not getting the shot. "
The Delta variant now accounts for 25% of all cases in the United States. It's estimated by the end of August that number will surpass 90%.