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VOL. 10, ISSUE 7 (2025)
Scrub Typhus and Orientia tsutsugamushi: Classification, life cycle, and the role of TSA56 in antigenic variation
Authors
Govind Sharma, Pragya Sharma, Dr. Devendra Kumar
Abstract
Scrub typhus, caused by Orientia
tsutsugamushi, is a neglected vector-borne disease of major public health
concern in the Asia–Pacific region. Unlike other members of the Rickettsiaceae
family, O. tsutsugamushi possesses distinctive biological features,
including an obligate intracellular lifestyle, absence of peptidoglycan, and a
highly repetitive genome. Transmission occurs via chigger mite larvae, and the
bacterium establishes infection by entering host cells, replicating
intracellularly, and spreading systemically. Among its surface proteins, the
56-kDa type-specific antigen (TSA56) is the most immunodominant, accounting for
up to 15% of total cell proteins. TSA56 plays a crucial role in adhesion
through fibronectin binding, immune evasion, and strain-specific antigenic
variation. Prototype strains such as Gilliam, Karp, and Kato have served as
reference points for studying antigenicity and molecular epidemiology.
Understanding TSA56 diversity is essential for improving diagnostic assays,
tracking strain circulation, and guiding vaccine development against scrub
typhus.
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Pages:208-213
How to cite this article:
Govind Sharma, Pragya Sharma, Dr. Devendra Kumar "Scrub Typhus and <i>Orientia tsutsugamushi</i>: Classification, life cycle, and the role of TSA56 in antigenic variation". International Journal of Entomology Research, Vol 10, Issue 7, 2025, Pages 208-213
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