Dr. Anthony Fauci, the former top infectious disease expert in the U.S., isn’t sounding alarm bells on the rising number of coronavirus cases in the U.S. yet, but he did caution that the trend will continue into the fall and winter months.

“I wouldn’t say that I’m alarmed but I’m certainly keeping an eye on it,” Fauci said on ABC’s “This Week” on Sunday. The former head of the National Institute of Allergy and Infectious Diseases is now a professor at Georgetown University.

“There’s no doubt, as you know and reported just a moment ago, we’re having an uptick in cases, which is being reflected by an uptick about 17 or more percent in hospitalizations. … And since we’re now at the end of the summer, it is likely that that will increase as we get into the fall and the winter. So, we need to be prepared for it,” Fauci said.