[On occupational leptospirosis in Leningrad].
D006801:Humans; D007922:Leptospirosis / Q000453:epidemiology*; D008462:Meat-Packing Industry; D009784:Occupational Diseases / Q000453:epidemiology*
LEPTOSPIROSIS/epidemiology; MEAT-PACKING INDUSTRY; OCCUPATIONAL DISEASES/epidemiology