Health expert Dr. Ashish Jha said Sunday that public health officials should stop using COVID-19 case data as the central metric by which the severity of the COVID-19 pandemic is measured.

Jha — the dean of the Brown University School of Public Health and a former health expert at Harvard University — explained on ABC News’ “This Week” the Omicron variant changes the game.

According to Jha, using case data to determine the severity of the pandemic is no longer reliable because Omicron appears less virulent despite being highly contagious.

“We have to do a shift. Look, for two years infections always preceded hospitalizations, which preceded deaths. So you could look at infections and know what was coming. Even through the Delta wave that was true because it was largely unvaccinated people who were getting infected,” Jha explained.