That's true testing hasn't been happening for 4 months , but you can extrapolate right. Calculate the number of duplicate test or better yet do random house hold surveys. and testing and apply some of these fantastic scientific brain cells and get a picture of what has happened. Actually it's been more than 4 months.
Household survey,
Have you tested positive one or more times? (counts as one positive)
Have you been sick? (counts as one positive)
Neither applies , please test.
Build a legit picture from there. There is a will to have a crap picture here. No excuses at all.