Joseph O'Dwyer (1841 – 1898) was an American physician. Father of laryngeal intubation in croup; O'Dwyer plain tube; system for intralaryngeal intubation; Fell-O’Dwyer apparatus
The vaccine is made from a cell-free purified toxin extracted from a strain of C. diphtheriae and treated with formaldehyde which converts it into a diphtheria toxoid. These are NOT live vaccines and can not cause the diphtheria.