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infection nosocomial infection bacteria hospital acquired infection morphology classification microbiology #hepatitis stain pyocin outbreak investigation colicin epidemiological marker bacteriocin sputum pneumonia tuberculosis infection prevention surveillance drug resistance animals zoonotic nepal himalaya staphylococcus virus nursing enteric fever typhoid fever salmonella prokaryote kingdom taxonomy detection of viruses virology #sexuallytransmittedinfection #serology #diagnosis #hepatitisbvirus acinetobacter