Pseudomembranous tonsillitis (grey, tough and very stickly membranes) with dysphagia, cervical adenitis, at times progressing to massive swelling of the neck}Airway obstruction and possible suffocation when infection extends to the nasal passages, larynx, trachea and bronchi}Low grade fever}Effects of the toxin: cardiac dysfunction (myocarditis with heart failure), neuropathies 1-3 months after the onset affecting swallowing, vision, breathing and ambulation}Renal failure