NEW YORK — New York City Health Commissioner Ashwin Vasan declared Monday morning that the city has elevated its COVID-19 threat level to a “medium risk alert” due to a recent increase in cases. It’s the first time Mayor Eric Adams’ administration has upgraded the COVID-19 threat level since he took control of City Hall on Jan. 1. Prior to Monday, the city was on “low risk alert.” “Cases have now surpassed a rate of 200 per 100,000 people in the five boroughs. As a practical matter, what this means for New Yorkers is that they must exercise even greater caution than they have the last few week…