CHICAGO (WLS) -- On the eve of Illinois' move to Phase 4 of reopening, Gov. JB Pritzker was asked if he was ready for the "risk" in allowing larger gatherings and having people going into restaurants and bars.[br /][br /]Gov. Pritzker said he watches the numbers every day and roots for them to go in the right direction. Still, there is some concern that reopening more of businesses could lead to a surge in cases as seen in other states right now.[br /][Ads /][br /][b][url HREF="https://abc7chicago.com/society/illinois-covid-19-cases-increase-by-894-with-41-new-deaths/6268076/" TARGET="" REL=""]WATCH: Illinois touts progress in COVID-19 fight [/url][/b][br /][media ID="6268474" /][br /][br /]Downtown Chicago is getting busier and it's likely to become even more crowded as Illinois moves to Phase 4, which worries some people, while others are more hopeful.[br /][br /]But epidemiologist Dr. Gary Slutkin does have a big concern. His experience includes working on several epidemics with the World Health Organization.[br /][br /]"It's a recipe for a lot of risk and the risks primarily are crowded indoor spaces," Dr. Slutkin said. "And up to 50 people is a lot of people."[br /][Ads /][br /][b][url HREF="https://abc7chicago.com/business/phase-4-in-illinois-gyms-movie-theaters-ready-to-reopen-friday/6266617/" TARGET="" REL=""]RELATED: Gyms, movie theaters ready to reopen as Illinois enters Phase 4 Friday[/url][/b][br /][br /]Dr. Slutkin said not enough people are wearing masks and he believes the general public still does not understand how prevalent and deadly COVID continues to be. He partly blames the messaging of flattening the curve.[br /][br /]"You never make a goal of bending a curve," Dr. Slutkin said. "You want to control the epidemic or get rid of the epidemic. Bending the curve is halftime."[br /][br /]][b]WATCH: Dr. Emily Landon shares advice ahead of Phase 4 reopening [/b][br /][media ID="6268413" /][br /][Ads /][br /]While other states are seeing spikes as they ease up restrictions, Gov. Prizker said Illinois is moving forward in a very measured way.[br /][br /]One of his advisers, University of Chicago's Dr. Emily Landon, said Thursday the timing is right.[br /][br /]"Now is a more forgiving time to move forward," Dr. Landon said. "We can be outside more, we can be more distant and that allows for a little bit of a safety net."[br /][br /]But Gov. Pritzker warned Illinois residents the metrics are being watched closely and he will move back to a previous phase if necessary.