Explanation:

Mathura in western Uttar Pradesh have reported cases of a mystery fever, which has been identified as scrub typhus.

Scrub typhus, also known as bush typhus, is a disease caused by a bacteria called Orientia tsutsugamushi.

Impact: The site where the chigger bites develop a dark, scab-like region, which is also known as eschar. After contracting the infection, a person can experience mental changes, ranging from confusion to coma. Some of the patients also develop joint pains, which is characteristic of chikungunya. The infection can lead to respiratory distress, inflammation of the brain and the lungs, kidney failure and then multi-organ failure, ultimately leading to death.