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[Epidemiology of rotavirus infection around Tokyo area]
Abstract:
Epidemiology of rotavirus infection was studied from 1981 to 1988 mainly in three hospitals around Tokyo area. Major serotypes of rotaviruses in the three places were different from those in two hospitals around Kansai area in Japan (Ref. 6, 13), while, major serotypes were same among three hospitals. Both of serotypes 1 and 4 in group A were mostly found around Tokyo area. Frequencies of type 2, 3, and 9 in group A were low, although the frequencies were various among periods. Detail examinations of rotavirus RNA electropherotypes showed the results as follows; different electropherotypes were found during one winter season and at one hospital, the identical electropherotype was found cross a year and cross a hospital. We could not find the identical electropherotype which belong to two serotypes so far. Seven group C rotaviruses were found since 1987 in three hospitals. It would be important to examine RNA electropherotypes and serotypes for long period not only for epidemiological studies but also for development of vaccine.
Insights
Rotavirus serotypes varied geographically in Japan between 1981-1988, with types 1 and 4 dominant near Tokyo. RNA electropherotyping revealed distinct patterns, crucial for understanding rotavirus epidemiology and vaccine development.
Area of Science:
- Virology
- Epidemiology
- Public Health
Context:
- Rotavirus is a leading cause of severe diarrheal disease in infants and young children globally.
- Understanding regional variations in rotavirus strains is essential for effective disease control and vaccine strategies.
- This study examines rotavirus epidemiology in Japan over an eight-year period.
Purpose:
- To investigate the epidemiological characteristics of rotavirus infections in Japan.
- To identify the predominant rotavirus serotypes and RNA electropherotypes in different regions.
- To assess the temporal and geographic distribution of rotavirus strains.
Summary:
- A longitudinal study (1981-1988) analyzed rotavirus infections in hospitals near Tokyo and Kansai, Japan.
- Group A rotaviruses, particularly serotypes 1 and 4, were prevalent in the Tokyo area, while other serotypes showed lower and variable frequencies.
- Distinct rotavirus RNA electropherotypes were observed within seasons and hospitals, with some conserved across time and locations. Seven group C rotaviruses were identified.
- No identical electropherotype was found to belong to two different serotypes.
Impact:
- Findings highlight significant geographic variations in rotavirus serotypes within Japan.
- The study underscores the importance of long-term surveillance of both RNA electropherotypes and serotypes.
- This data is critical for informing the development and implementation of targeted rotavirus vaccines.