What has become apparent now that we're doing testing via nasal swab, is that there is a large population of people who are transmitting the virus from their nasal passages and they have no idea that they are infected. These people, if they have symptoms, think they "have allergies" or they may feel perfectly fine.
When they go outside with a mask on, they may be thinking, "I'll put on a mask so that I don't get the virus" when in fact, they have the virus and the mask is blocking droplets from their nose and mouth from getting into the air.
At one point, the Chinese were flying drones in Wuhan and threatening to arrest anyone walking on the street who didn't have on a mask. This hints that they viewed the masks as preventing transmission of the virus, even if it was actually stopping infected people from shedding virus into the public spaces.
It's not unreasonable either to think allergies given that its late March and the pollen/mold counts are high. I feel like I do every year at this time. I wouldn't know how to tell the difference. I wonder if nasal and sinus irrigation would flush out some virus or even kill it deep in the sinuses, if you have it? I guess it would. I do this regularly anyway during allergy season, salt, baking soda, about 30 drops H2O2, 60ml warm water in a Waterpik. Feels great.

