Other possibilities needed to be ruled out are viral exanthem, Mycoplasma pneumoniae - serological test and chest radiography is important to rule out and should be treated with appropriate antibiotic, Rocky Mountain spotted fever (it is tick borne disease and needs serological test for diagnosis), infectious mononucleosis, and
scarlet fever; as a result
of streptococcal tonsillopharyngitis, Kawasaki disease, and dengue. Hence, you need to undergo serological tests for few common causes.