Scrub typhus: Understanding the mite-borne bacterial infection

Scrub typhus is caused by the bacterium Orientia tsutsugamushi and spreads to humans through the bite of infected larval mites, commonly known as chiggers. Unlike dengue or malaria, which are transmitted by mosquitoes, this disease requires direct contact with contaminated mites found in scrubby vegetation and grasslands. The infection gets its name from the scrubland terrain where the mite vectors typically thrive.

The disease presents symptoms including high fever, headache, muscle aches, and a characteristic skin lesion at the bite site, known as an eschar. Patients may also experience swollen lymph nodes and rash. Symptoms typically appear seven to ten days after infection and can progress to severe complications if left untreated, including organ damage and respiratory distress.

Scrub typhus remains endemic across much of Asia, with cases concentrated during monsoon and post-monsoon months when mite populations are at their peak. Early diagnosis through blood tests and prompt antibiotic treatment, typically with doxycycline or other appropriate antibiotics, can effectively manage the infection and prevent serious outcomes. Healthcare providers recommend protective measures including wearing long sleeves and trousers in endemic areas and using insect repellents when venturing into scrubland regions.