So, it can be possible to have a strep throat not group A or not large colony group C or G and not have an invasive strain or a strain that may not go beyond the throat
and become a more serious infection
. There is another bacteria called Arcanobacterium haemolyticum, that causes pharyngitis (sore throat) and also can become endocarditis. However, you haven't had a culture done. So, I am giving you what I know and it is up to you to decide here.