sentences:  He did his medical residency at the hospital associated with the Rockefeller Institute.At Rockefeller he did research on synovial fluid from people with RA and in 1937 found "Mycoplasma" in the fluid from some patients, leading him to believe that RA might be an infectious disease.His work was interrupted by service in World War II; after the war he obtained a position at George Washington University and began to experimentally treat some people with RA with antibiotics, which at the time were a new class of drugs.Some of the people he treated were members of Congress or ambassadors, and some of them responded positively.