This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Vector of scrub typhus in man - 
Select and explain. 
A. O. Tstsugamushi, B. Leptotrombidium deliense, C. Lice, D. Pediculous humanus
B: Leptotrombidium deliense
Answer: B: Leptotrombidium deliense 
Explanation: <p> scrub typhus:- Causative agent- Rickettsiae tsutsugamushi. Reservoir-Trombiculid mite.( Leptotrombidium delinese and L.akamushi). The infection is maintained in nature transovarially from one generation of mite to the next. The nymphal and adult stages of mite are free living in soil.they donot feed on veebrae host. Larva feed on veebrate host and picks up the Rickettsiae. Incubation period- 10-12 days. Clinical features- fever with chills, headache, malaise, prostration and maculopapular rash appearing around 5th day of illness. Eschar seen at bite site. Weil felix reaction strongly positive. Treatment- tetracycline Vector control Personal prophylaxis. {Reference: park&;s textbook of preventive and social medicine, 23rd edition, pg no.300}</p>