Vector of scrub typhus in man ?
**Core Concept**
The vector of scrub typhus, a disease caused by the bacterium *Orientia tsutsugamushi*, is a critical aspect of understanding the transmission dynamics of this zoonotic infection. Scrub typhus is primarily transmitted through the bite of infected chiggers, which are the larval stage of certain mites.
**Why the Correct Answer is Right**
The correct vector is the larva of the trombiculid mite, specifically the genus *Leptotrombidium*. These mites act as both the vector and the reservoir for *O. tsutsugamushi*. When an infected mite feeds on the blood of a human, it transmits the bacteria, leading to infection.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not specify the vector known to transmit scrub typhus.
**Option B:** Incorrect as it is not recognized as a vector for this disease.
**Option C:** Incorrect because, although mites are involved, this option lacks specificity regarding the stage and type of mite responsible.
**Option D:** Incorrect as it is unrelated to the transmission of scrub typhus.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that the transmission of scrub typhus occurs through the bite of infected chiggers, and the disease is endemic in certain regions of Asia-Pacific.
**Correct Answer:** D. Leptotrombidium deliense