Probably, I know several users who can predict a week before that they are getting sick by the raise in their resting heart rate.
Since this virus attacks the lungs I expect the EOV will be affected.
But Fitbit has been helpful in other ways.
The Fitbit heart rate has been used to determine time of death, pregnancy, there also are a few cases, like the one in NJ, where having a Fitbit has helped in replacing the normal needed testing.
Several users have mentioned the EOV graph was helpful to their doctor. Data from the Fitbit tracker has also been used in several court cases to prove people where hiding what they where doing, such as proof that they where the killer and others where found cheating on partners during deceive cases. also one case proved the user was responsible for the car accident and the resulting death.