typhus bacteria under a microscope

macro microscope gram negative bacteria bacteremia microbes serotype typhi epidemic human salmonella virus gramnegative rod gastroenteritis microorganisms microbe fecal coliform paratyphi enterica enterobacteriaceae disease illness bacterium background bacillus typhoid fever intestinal food diarrhea medicine microbiology infection microscopic science organism medical microorganism flagella enteric typhus intestine salmonellosis vomiting drug resistance antibiotic