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Published on: March 15, 2019
[Epidemiological study of tsutsugamushi disease in Gunma prefecture. A special field study and serotype]
K Wakai1, K Funada, T Nakajima
1Gunma Prefectural Institute of Public Health and Environmental Sciences.
Abstract:
An epidemiologically investigated of invasion of Rickettsia tsutsugamushi, inhabitant of mites and serum sample from patients with Tsutsugamushi disease in Gunma prefecture from 1984 to 1994 was made. Our data clearly indicated that Rickettsia tsutsugamushi was not located but widely spreaded throughout the Prefecture. Mites on rodents, were classified into 4 genus and 12 species and about 15% of them were Leptotrombidium pallidum and Leptotrombidium scuttellare, well known virulent vectors. The highest incidence rate of this disease was observed in the northwest area of the Prefecture from October to December, while a smaller number of patients occurred in other areas and in other months. About fifty percent of the serum samples from the patients were positive to the Karp strain. These results suggest that the major cause of this disease is the Karp strain and the disease could occur potentially in various areas of the Prefecture.
Insights
Tsutsugamushi disease, caused by Rickettsia tsutsugamushi, is widespread in Gunma Prefecture. The Karp strain is the primary cause, with peak incidence from October to December in the northwest.
Area of Science:
- Epidemiology
- Medical Entomology
- Infectious Diseases
Context:
- Tsutsugamushi disease, caused by Rickettsia tsutsugamushi, is a significant public health concern.
- Mite vectors, particularly Leptotrombidium species, are known reservoirs for Rickettsia tsutsugamushi.
- Previous epidemiological data for Gunma Prefecture was limited.
Purpose:
- To investigate the epidemiological distribution of Rickettsia tsutsugamushi and Tsutsugamushi disease in Gunma Prefecture.
- To identify the prevalent strains of Rickettsia tsutsugamushi.
- To determine the primary vectors and seasonal patterns of the disease.
Summary:
- A decade-long epidemiological study (1984-1994) in Gunma Prefecture revealed widespread Rickettsia tsutsugamushi.
- Leptotrombidium pallidum and Leptotrombidium scuttellare were identified as significant mite vectors.
- The Karp strain was detected in approximately 50% of patient serum samples, indicating it as the major etiological agent.
- Peak disease incidence occurred from October to December, predominantly in the northwestern region.
Impact:
- This study highlights the extensive geographical distribution and endemic nature of Tsutsugamushi disease in Gunma Prefecture.
- Identifies the Karp strain as the primary cause, informing diagnostic and treatment strategies.
- Provides crucial data for public health interventions and vector control measures to mitigate disease transmission.
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