I would say this virus has been around since before Christmas. My business partner, she returned from holidaying in Cancun few weeks before Christmas. She came down with the worst case of flu she has ever had and she is never ill. Cough, cold core temperature but sweating on the outside. Can't hold anything down, being sick. In bed for four days. I didn't see her for at least 10 days.
Few weeks later i had my normal Christmas cold. Off for two days, not flu. By chance weather was crap so didn't have to fly with anyone for a few week.
Fortunately a lot of trial lessons have already cancelled and moved their bookings to late April.
Mass testing of folks entering hospital will peak next week or two and by mid April all the fuss will be over.