How likely is a covid infection from this scenario?

[MerinoFroggie]

A teacher in a child's class is a covid positive.

How likely is it the child will go on to become a covid positive from a teacher being positive?

I don't know what the protocols were in the school. If the windows were left open for ventilation, if masks were worn by the adults in the class, etc?

I don't know anything about the teacher and where the infection came from - if the teacher picked up the infection in her own private life or if it came from the school.

Depends how close the child was to the teacher and for how long.

thats hard nd impossible to know really without any idea of knowing if there was ventilation, time spent with them, did they keep distance, touch anything etc etc etc
where does the child sit when in the teachers class?

Depends on what age of kid/length in the class.

Impossible to tell.

It could vary from highly likely (if that teacher is the sole teacher of the class, no masks worn, windows closed, teacher spends time helping that child one-to-one and is generally milling around the class) to not very likely at all (teacher wears mask, stands behind spit-guard/screen, only taught child for one lesson, child at back of class, windows open....)

It's a special needs class with several teachers. Each teacher is assigned a student, one to one. The child I'm talking about does not work with the teacher in question but they are in the same room together.

Ah, that's a crappy situation. Who knows if the child will get it, but the child has been exposed and I think the right thing to do is to assume they have it and behave accordingly. But if test and trace haven't been in touch, maybe they don't consider the child a close contact?
Has the child been asked to self isolate?

Hard to tell, totally depends on distancing/time. A teacher at our school had it and one child later has a positive result. Obviously others could have been asymptomatic, we don't know. 30 in class.

Pointless question.

When we had an outbreak in my primary class 6 of us tested positive.

Impossible to say, depends how much virus the teacher was shedding and how susceptible the child is. For example my ds1 has had it (mildly) twice but ds2 seems to be Corona-proof (or at least entirely asymptomatic despite twice living in a houseful of people coughing it all over him.

The first symptom the teacher had was a loss of taste. The teacher was in work for 2 days before a loss of taste was experienced.

Unless the windows are wide open, then someone could be in one corner and someone in another get it. I hope the child stays well but you won’t know if they’ll get it for the next 10-14 days sadly.

It really is impossible to say , my sister had it and her husband didn’t catch it off her , some people who have been really careful have still managed to catch it .

Honestly OP it could go either way. None of us can tell you which way.

Impossible to say. Also depends on what variant of COVID it is. (I.e is it the super-infectious version.)

We all got COVID and in the pre-symptomatic stage my son was in school. No other children in his class tested positive - so they was no spread that came from us.

There was a good analysis of this in El Pais. Essentially, fairly likely if no masks or ventilation.

english.elpais.com/society/2020-10-28/a-room-a-bar-and-a-class-how-the-coronavirus-is-spread-through-the-air.html