Hi, my nearly four year old son, had a diarrhea since being at school today, Last time he pooed his pants starting with pink mucus with some blood spot, then had a more normal stool after getting to the toilet. He s had a chest infection about 10 days ago and got wrong antibiotic which cause him very sick and a lot of stomach upset, it settled AFTER antibiotic has been changed. He doesnt seem very ill today but ive never seen blood in his stool. Is that dangerous? Are those two incidents possibly connected or could it just be a virus causing this?