I guess we all have experience with coccus bacteria without even knowing it. There are few people who get through their entire lives without developing strep throat at least ponce. Me personally, I have probably had it a dozen times in my life.
Its crazy to think of how ubiquitous this bacteria is. In every human population on every part of the earth there is streptococcus bacteria that produces just about the exact same reaction in all humans. It is more common than any plant or animal on the face of the earth.