I've put my little man into care from April this year and only one day a week. He has had two bouts of tonsilitis since and spent more time at home than at care. And the carriers of tonsilitis are contagious until they show symptoms. I notified the service once I had the diagnosis but why didn't the other parents?
Possibly if you could keep them at home for the day and see how they go. Everyone is in the same boat.
We all have to work or study and childcare costs us money.
When is a runny nose just a runny nose? How can you tell?