Risk Factors Associated with Adult Scrub Typhus Cases in a Tertiary Care Hospital - A Case Control Study.

Area of Science:

• Epidemiology
• Infectious Diseases
• Public Health

Background:

• Scrub typhus is an endemic and re-emerging infectious disease in South and East Asia, including India.
• The severity of scrub typhus ranges from mild to fatal, necessitating research into its associated socio-environmental factors.
• Understanding risk factors is crucial for developing effective prevention strategies against scrub typhus.

Purpose of the Study:

• To identify environmental factors associated with scrub typhus risk in adults.
• To investigate human behaviors that increase susceptibility to scrub typhus.
• To inform public health interventions for scrub typhus prevention.

Main Methods:

• A hospital-based case-control study was conducted.
• 112 adult scrub typhus cases were compared with 112 clinical controls and 112 geographical controls.
• Data on environmental exposures and clothing habits were collected.

Main Results:

• Living near swampy areas (OR=4) and firewood piles (OR=2) significantly increased scrub typhus risk.
• The presence of Eschar (55.4%), pallor (33.9%), and hepatomegaly (24.1%) were common clinical signs.
• Wearing full top clothing (aOR=0.65) and fully covered bottom clothing (aOR=0.17) demonstrated protective effects.

Conclusions:

• Environmental factors, such as proximity to swamps and firewood, play a significant role in scrub typhus transmission.
• Human behaviors, including clothing choices, can mitigate the risk of contracting scrub typhus.
• Targeted public health measures addressing environmental and behavioral risks are essential for controlling scrub typhus.