https://www.nlm.nih.gov/medlineplus/ency/article/000655.htm MedlinePlus [nlm.nih.gov] https://www.nlm.nih.gov Pharyngitis [nlm.nih.gov] "Pharyngitis", MedlinePlus Medical Encyclopedia National Institutes of Health US National Library of Medicine [nlm.nih.gov] https://www.nlm.nih.gov/medlineplus/ency/article/000655.htm [nlm.nih.gov] "Pharyngitis", MedlinePlus Medical Encyclopedia pharyngitis