Which of the following organism can cause acalculous cholecystitis?
Leptospirosis
Malaria
Staphylococcus
Nocardiosis
Precipitating factors for acalculous cholecystitis are vasculitis, obstructing adenocarcinoma of the gallbladder, diabetes mellitus, torsion of the gallbladder, "unusual" bacterial infections of the gallbladder (e.g., Leptospira, Streptococcus, Salmonella, or Vibrio cholerae). Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 2621