CP and laryngitis: Recently clinical studies have also found that CP antibodies were detected to be significantly higher than those in the corresponding control groups [4] in a variety of systemic diseases, such as pharyngitis, laryngitis, tympanitis, sinusitis, sarcoidosis, malignant lymphoma, multiple sclerosis, senile dementia, lung cancer, premature birth, and premature rupture of membranes [3, 4, 8].