Boyd, Mark F.2012-01-242012-01-2419202012-01-24http://hdl.handle.net/2152.3/332Two laboratory workers shaving a guinea pig. Guinea pigs were used to determine the diagnosis of suspected plague rats through inoculation. Thirty-three rats were positively diagnosed with plague after animal inoculation.4.5 x 6.5 in. black-and-white photographimage/jpegen-USBubonic plagueGalveston Plague LaboratoryUnited States Public Health Service