scientist's hand in latex glove holding the bacteria growing pet

pathogens agar background bacteria bacterial bacteriology biosafety black colony culture diarrhea differential disease dish enteritidis enterobacteriaceae fever food glove grow hand hazard holding identification infection laboratory latex medical medium microbiology observe open pathogen petri plate poisoning research researcher salmonella salmonellosis scientist selective shigella streak technician test toxic transparent typhi typhoid virulence