Yes, It is called viral load.
Explanation from a hospital doctor:
“If I sit with one person and catch this virus, I get a small viral load. My immune system will start to fight it and by the time the virus starts replicating, I’m ready to kill it.
No medicines will help this process meaningfully hence there is no “cure” for this virus. All we can do is support you with a ventilator and hope your immune system can catch up fast enough.
If I sit in the same room with six people, all shedding I get six times the initial dose. The rise in viral load is faster than my immune system can cope with and it is overrun. I then become critically ill and need me (or someone of my specialty) to fix it instead of just being at home and being ok in the end.
THIS BIT IS IMPORTANT:
If you are a large family group, remember that by being ill and in the same room, you will make each other ill or “more ill”. If you get sick, isolate just yourself into one room and stay there. Don’t all sit in one room coughing. You will increase the viral load for all of you, reducing your survival rate.
A family of six people may produce double the droplets of a family of three in the same space. Maths is important.
If one of you is symptomatic, assume you are all shedding and make sure you keep some space.
Parents are getting it from their kids because no one is going to stop comforting their child (nor should they) so the parent gets a big hit as well as the child. I don’t think that can be helped.
REMEMBER: THINK ABOUT VIRAL LOAD
It could save your life or your child’s.”
Source: A consultant with Cov & Warwickshire Hospitals and also a trained trauma doctor with the Air Ambulance service