'Signs of 3rd wave' evident in Waterloo region: Dr. Wang Dr. Hsiu-Li Wang, the region's medical officer of health, says the third wave of the COVID-19 pandemic has started in the community. Social Sharing CBC News · Posted: Apr 09, 2021 2:27 PM ET | Last Updated: April 10 Waterloo region now has entered the third wave of the COVID-19 pandemic, said medical officer of health Dr. Hsiu-Li Wang. (Evan Mitsui/CBC)