I find it unlikely that you would have much insight into the severity of disease in the 400 people in an entire community unless you just mean that no one died

I find it unlikely that you would have much insight into the severity of disease in the 400 people in an entire community unless you just mean that no one died or hospital admissions were low. Because covid (or the flu for the matter) can be awefully severe and miserable and long lasting without requiring hospitalization.