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Serratia marcescens
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Rod-shaped Gram(-) Enterobacteria. Human pathogen involved in hospital-acquired infections (HAIs), particularly catheter-associated UTIs.Generally BSL-1 but some strains can be BSL-2
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Alcaligenes faecalis
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Gram - rod. BSL-2. Common in soil, water and associated with humans. Typically nonpathogenic but sometimes cause infections.
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Aquaspirillum itersonii
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Gram -, spiral
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Bacillus cereus
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: Gram (+) rod, spore former, soil bacteria, can cause food poisoning. BSL-1
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Bacillus subtilis
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Gram (+) rod, spore former, beneficial soil bacteria for healthy plant roots. Non-pathogenic. Model organism for endospore genetics & biochemistry.
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Clostridium botulinum
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Gram +, rod; Produces a life-threatening neurotoxin which causes botulism (food poisoning)
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Clostridium difficile
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Gram +, rod; Causes antibiotic-induced diarrhea, fecal transplants
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Clostridium tetani
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Gram +, rod; Produces the toxin which causes tetanus.
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Corynebacterium xerosis
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Gram +, rod; Mueller-Hinton tellurite agar selective
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Enterobacter aerogenes
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Gram -, rod; lactose fermenter, pink on EMB agar. beta hemolysis
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Mycobacterium smegmatis
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Gram + rod, used for Acid-fast staining
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Enterococcus faecalis
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Gram +, cocci; gamma hemolysis on blood agar. BSL-2. group d strep. high antibiotic resistance.
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Escherichia coli
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Gram(-) rod, facultative anaerobe, part of the healthy intestinal microbiome. Most strains harmless (BSL-1), some serotypes can cause severe food poisoning
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Klebsiella pneumoniae
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Capsule staining; Capsule is often present in pathogenic bacteria like...
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Micrococcus luteus
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Gram(+) cocci found in soil, water, air, and as part of the normal skin microbiome. BSL-1
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Pseudomonas aeruginosa
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Gram(-) rod. Can be pigmented (ie: pycocyanin). Major cause of lung infection for people with cystic fibrosis (shown) = biofilm. BSL-2
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Staphylococcus aureus
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Gram(+), coccus. Harmless skin bacteria to MRSA (Methicillin-resistant ) BSL-2
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Salmonella typhimurium
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Gram -, rod; Non-lactose fermenter
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Staphylococcus epidermidis
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Gram +, cocci; differential for Mannitol salt agar
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Dextran
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clings to the teeth and forms dental plaque, in which bacteria reside and ferment fructose with the formation of lactic acid = Dental caries.
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Streptococcus mitis
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Gram +, cocci; Part of oral flora; small, flat, light blue colonies
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Strep mutans
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Involved in formation of dental caries; Produces undulate colonies, with a granular "Frosted-glass/Blue crystal" excretes an enzyme called dextransucrase.
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Streptococcus sanguis
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Raised, smooth, hard colonies embedded in agar
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Strep salivarius
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Produces gummy, mucoid, "Gum-drop" colonies.
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Lactobacilli acidophilus
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(Gm+ rod) produces lactic acid and other organic acids that reduce the oral acid concentration to a pH of less than 5. At this pH, decalcification occurs and dental decay begins.
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