[quote StatisticalSense]@Shitfuckoh
The staff should be distancing from each other (except in very limited circumstances regarding personal care that requires 2 staff and even in such cases it should be the same combination of staff each time) even if they can't distance from pupils. It is beyond unrealistic that 2 children would have managed to infect 17 teachers without infecting a single other child, however it is completely realistic that teachers have infected each other by failing to social distance or otherwise follow the guidance.[/quote]
In a special school you may ell have 5+ adults within a single room, caring for a single group of pupils. Within that room, air will be shared, PPE will not be used and there will not be enough space for SD - exactly the same as for normal classrooms, but with a higher than usual adult:child ratio.
Equally, because of the intensity of the work, adults may be on rotas, so the group of 5+ may well not be consistent all day every day, to allow for necessary breaks, and it may be that adults will work together closely with a child at certain points in the day.
So while you may be picturing adults close together e.g. in a staff room or corridor or meeting outside school, it is far more likely that those 17+ were following full guidance BUT were sharing classrooms too small to socially distance as part of their normal work.