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: Social & Preventive Medicine
Vectors may transmit infection by all of the following methods, EXCEPT: 
Select and explain. 
A. Ingestion, B. Regurgitation, C. Rubbing of infected faeces, D. Contamination with body fluids
A: Ingestion
Answer: A: Ingestion 
Explanation: Methods by which vectors transmit an infectious agents are: Biting Regurgitation Scratching in infected faeces Contamination of host by body fluids of vectors Ref: Preventive and Social Medicine, by K.Park, 19th edition, Page 92.