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Bubonic plague appeared in New Orleans in 1914. State and city authorities immediately requested the Public Health Service to take charge of the plague control operations. Since it was now known that the disease was transmitted by fleas from infected rats, rat-trappers, such as these, would set baited traps all around the city and then visit them twice daily. The trapped rats were removed, labeled with the specific address at which they were caught, placed in galvanized buckets or cloth bags, and returned to the laboratory where the laboratory workers would examine them for signs of plague infection. The daily total could run as high as 4,000 to 5,000 rats.
c. 1914
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