This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Oroya fever is caused by: 
Select and explain. 
A. B. bacilliformis, B. B. henselae, C. B. quintana, D. B. elizabethae
A: B. bacilliformis
Answer: A: B. bacilliformis 
Explanation: Ans: a. B. bacilliformis Baonellosis, or Carrion's disease, is caused by B. bacilliformisBaonellosis, or Carrion's disease, is caused by B. bacilliformis. The disease is characterized by two distinct phases:an acute febrile hematic phase, known as Oroya fever; andan eruptive phase manifested by cutaneous lesions, known as verruga peruana