The Bradford Factor formula itself is: S² x D = B.
This means that the number of spells of absence (S) is multiplied by itself, with that number then multiplied by the total number of days a person was absent (D) during a 52-week period.
For example:
If Jeff calls in sick six times (S = 6), taking two days off on one occasion and one day on each of the other five (therefore D = 7), then his Bradford Factor score would be 252 (because 6 x 6 x 7 = 252).
Meanwhile, if Amelia has only two spells of absence in the same year, but takes more days off (three days on one occasion and six days on the second), then her Bradford Factor score would be 36 (2 x 2 x 9 = 36).
If people took time off every time they have a cold their score would be terrible and they would face disciplinary action.
I work in a school and it is explicitly stated that we are expected to come in if we are able to work irrespective of if we have covid etc. Of course the expectations are the same for students so it is an absolute germ fest hence I have had 3 separate cold/flu/rsv/covid infections (no test so I don't know which) since September.
I did hope we would learn from covid and start to be more infection aware and stop behaving in ways that spread things so much. Alas it appears not to be so.