<prompt> Which of the following is obligate aerobe?Pseudomonas aeruginosaE.coliProteusC. diphtheria  <response>: Ans. a Pseudomonas aeruginosa. Ref. Anantanarayan, Microbiology, 4thpg.310 E.g.CommentsObligate aerobesNocardia,Pseudomonas aeruginosa,Mycobacterium tuberculosis,Bacillus.Use an O2-dependent system to generate ATP.M. tuberculosis has a predilection for the apices of the lung, which have the highest PO2.Obligate anaerobesActinomyces.Bacteroides,ClostridiumThey lack catalase andor superoxide dismutase and are thus susceptible to oxidative damage. ABCs.Generally foul smelling short-chain fatty acids, are difficult to culture, and produce gas in tissue CO2 and H2.Urease- positiveH. pylori,Proteus,Klebsiella,Ureaplasma. a-hemolyticStreptococcus pneumoniaViridans streptococciCatalase negative and optochin sensitive.Catalase negative and optochin resistant.b-hemolyticStaphylococcus aureusStreptococcus pyogenes--group A strepStreptococcus agalactiae--group B strepListeria monocytogenesCatalase and coagulase positiveCatalase negative and bacitracin sensitive.Catalase negative and bacitracin resistant.Tumbling motility, meningitis in newborns, unpasteurized milk.PSEUDOMONAS AERUGINOSA WATER BUG Gram-negative, motile bacteria polar flagella Obligate aerobe used for anaerobiosis Produce number of pigments pyocyanin, fluroscien, pyoverdin, pyorubin, pyomelanin Produces exotoxin A, which acts similar to diphtheria toxin Selective media - cetrimide agar Most common cause of septicemia after blood transfusion. Most common infection in cystic fibrosis Most common cause of nosocomial pneumonia Most common and serious infection in bums Most common infection caused by it, outside the hospitals -CSOM Ecthyma gangrenosum Shanghai fever Infantile diarrhoea Melioidosis - P.pseudomalleiQ 