Answer: Gram-negative bacteria
Notes: Isolated Gram-negative organisms include Pseudomonas, Klebsiella, Proteus, Salmonella, Providencia, Escherichia, Morganella, Aeromonas and Citrobacter. Fimbria and pili are thin, protein tubes. It originates from the cytoplasmic membrane found in almost all Gram-negative bacteria.
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