EXPLANATION
The most likely diagnosis is Pseudomonas aeruginosa. Pseudomonas is an oxidative Gram-negative rod. It produces a characteristic blue pigment when grown on agar. Wounds infected with Pseudomonas also have a characteristic grape-smelling odor. Pseudomonas can survive in water. It is an opportunistic infection that commonly affects immunocompromised patients. It is particularly dangerous for patients with cystic fibrosis. It is also a common cause of infections in hospitalized patients.
Acinetobacter is a Gram-negative coccobacillary organism. It also survives well in wet environments. It most commonly causes pneumonia or urinary tract infections. In hospitals, it may be transmitted through contaminated respiratory equipment. It does not produce pigment or have a characteristic smell.
Aeromonas is a rare cause of soft tissue infections acquired through fresh or salt water. Although uncommon, it is highly virulent. It does not produce pigment or have a characteristic smell.
Moraxella is a Gram-negative rod most commonly associated with respiratory tract infections. It does not produce pigment or have a characteristic smell.
Pleisomonas is a Gram-negative rod that may produce an enterotoxin-mediated diarrhea. It does not produce pigment or have a characteristic smell.
REFERENCES
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