This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology Pa-2 (RNA Virus Pa-1,2 & Miscellaneous Viruses), Subject name: Microbiology
Incubation period of Rabies depends on: 
Select and explain. 
A. Severity of bite, B. Number of bite, C. Site of bite, D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: 1. Incubation period of Rabies is 1-3 months. 2. The incubation period is less: If the patient is bitten on the head or neck. If inoculum is heavy. Multiple bites. Deep wounds, or large wounds in Children. 3.Pathogenesis of Rabies Mode of transmission - Bite (most common), lick on abrasion, corneal transplant, air borne. Mode of spread - Sensory Nerve - UMN - sympathetic - nervous system. Speed of rabies progress in sensory nerve - 3mm/hr.