During the latter part of winter 1967, 58 cases of plague occurred in Cam Ranh City, Republic of Vietnam. Fifty-five patients had buboes, six had pneumonia, and one had septicemia. Causes of the epidemic included favorable temperature and humidity, a known infected rat population which was rapidly increasing in numbers, a high flea index, and a nonimmunized human population. In 54 of the patients, the disease developed over an eight-day period; and in 42 patients it occurred in a single compound of some 1,500 Vietnamese workers. All patients were treated with streptomycin sulfate and tetracycline hydrochloride or chloramphenicol. There were no deaths among those treated.
Conrad FG, LeCocq FR, Krain R. A Recent Epidemic of Plague in Vietnam. Arch Intern Med. 1968;122(3):193-198. doi:10.1001/archinte.1968.00300080001001