Answer:
Control and Prevention of two cases of novel coronavirus, ... they became ill and have been self-isolating at home ever ...
The first word is Sink and the second is denser
The answer is a stream. The water leaves a lake through a stream to maintain the freshness of the lake waer. A stream is where the water flows downhill from an open lake. An open lake is where the water flows constantly so that the water is fresh.
It is in Mexico! :) Hope this helped