Scrub typhus is caused by *Orientia tsutsugamushi*, transmitted by the bite of infected **chiggers**, which are larval stages of **mites**. Lice and ticks are not vectors for this disease. Milk is not a transmission route. The key vector is the mite, specifically the chigger mite.
**✓ Correct: C. Mite**
✓ Correct Answer: C. Mite
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