Xenopsylla cheopis and Plague: Biology, Transmission, and Control

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Year : 2026 | Volume : 3 | 02 | Page :
By

Atul Khajuria,

Kiran Kumari,

Tapaswi Ram Khajuria,

  1. Dean, Allied & Health Care Sciences, Rayat Bahra Professional University, Hoshiarpur – Chandigarh Rd, VPO, Bohan, Hoshiarpur, Punjab, India
  2. Retd. Govt. Master, Education Dept.,Govt. High School, Pachote, Chenani, Udhampur, J&K, India
  3. Retd. Lecturer, Education Dept. Govt. Higher Sec School, Barola, Udhampur, J&K, India

Abstract

Xenopsylla cheopis, the oriental rat flea, remains the most important vector of Yersinia pestis in classical rodent–flea–human plague cycles. Its biology is tightly adapted to commensal rats, especially Rattus rattus and Rattus norvegicus, whose nests provide microhabitats that support all pre adult stages and favour persistent flea populations near humans. The flea’s holometabolous life cycle, including the capacity for prolonged pupal quiescence and opportunistic host-seeking by adults, underpins its ability to maintain transmission potential through periods of environmental or host fluctuation. Mechanistic studies have shown that X. cheopis transmits Y. pestis via multiple complementary pathways. The classical blocked flea mechanism depends on biofilm formation in the proventriculus, foregut obstruction, and regurgitative inoculation of bacilli during repeated, abortive feeding attempts, making individual blocked fleas highly efficient transmitters. Early-phase transmission, occurring in the first days after an infectious blood meal, enables unblocked fleas to transmit before a mature biofilm develops and is now recognized as a key driver of rapid epizootic spread in susceptible rodent populations. More recently, demonstration of transovarial transmission has revealed that infected X. cheopis can vertically pass Y. pestis to their progeny, sustaining low level infection in flea populations during inter epizootic periods and providing a cryptic reservoir of vectors. Ecological and epidemiologic data confirm that X. cheopis operates within complex multi host, multi vector systems shaped by climate, land use, and socio economic conditions. Plague foci arise where rodent communities, flea fauna, and human habitats intersect, and long term surveillance indicates that increases in Y. pestis detection in rodents and fleas often precede human cases, supporting integrated animal based early warning. At the same time, widespread insecticide resistance in X. cheopis—including pyrethroid and organochlorine resistance linked to knockdown resistance mutations—poses a major challenge to vector control and demands robust monitoring of resistance, insecticide rotation, and strengthened environmental management. Population genetic analyses reveal significant spatial structuring and heterogeneous gene flow among X. cheopis populations, influenced by rodent ecology and human transport networks, with implications for the spread of resistance alleles and Y. pestis lineages. Parallel genomic studies on Y. pestis have clarified how biofilm regulating and metabolic genes optimize flea borne transmission, illustrating coevolution between pathogen and vector. Collectively, these findings underscore that effective plague prevention requires an integrated approach combining clinical vigilance, rodent and flea surveillance, resistance aware vector management, and attention to broader ecological drivers.

Keywords: Xenopsylla cheopis, oriental rat flea, Yersinia pestis; plague, vector competence, early phase transmission, blocked flea, transovarial transmission, biofilm, insecticide resistance, population genetics, Madagascar, rodent–flea cycle, zoonosis, vector control.

How to cite this article: Atul Khajuria, Kiran Kumari, Tapaswi Ram Khajuria. Xenopsylla cheopis and Plague: Biology, Transmission, and Control. International Journal of Insects. 2026; 03(02):-.
How to cite this URL: Atul Khajuria, Kiran Kumari, Tapaswi Ram Khajuria. Xenopsylla cheopis and Plague: Biology, Transmission, and Control. International Journal of Insects. 2026; 03(02):-. Available from: https://journals.stmjournals.com/iji/article=2026/view=259483

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Ahead of Print Subscription Review Article
Volume 03
02
Received 18/04/2026
Accepted 07/05/2026
Published 16/07/2026
Publication Time 89 Days

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