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Dive into the research topics where Charnchudhi Chanyasanha is active.

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Featured researches published by Charnchudhi Chanyasanha.


PLOS ONE | 2014

Online Respondent-Driven Sampling for Studying Contact Patterns Relevant for the Spread of Close-Contact Pathogens: A Pilot Study in Thailand

Mart L. Stein; Jim E. van Steenbergen; Charnchudhi Chanyasanha; Mathuros Tipayamongkholgul; Vincent Buskens; Peter G. M. van der Heijden; Wasamon Sabaiwan; Linus Bengtsson; Xin Lu; Anna Thorson; Mirjam Kretzschmar

Background Information on social interactions is needed to understand the spread of airborne infections through a population. Previous studies mostly collected egocentric information of independent respondents with self-reported information about contacts. Respondent-driven sampling (RDS) is a sampling technique allowing respondents to recruit contacts from their social network. We explored the feasibility of webRDS for studying contact patterns relevant for the spread of respiratory pathogens. Materials and Methods We developed a webRDS system for facilitating and tracking recruitment by Facebook and email. One-day diary surveys were conducted by applying webRDS among a convenience sample of Thai students. Students were asked to record numbers of contacts at different settings and self-reported influenza-like-illness symptoms, and to recruit four contacts whom they had met in the previous week. Contacts were asked to do the same to create a network tree of socially connected individuals. Correlations between linked individuals were analysed to investigate assortativity within networks. Results We reached up to 6 waves of contacts of initial respondents, using only non-material incentives. Forty-four (23.0%) of the initially approached students recruited one or more contacts. In total 257 persons participated, of which 168 (65.4%) were recruited by others. Facebook was the most popular recruitment option (45.1%). Strong assortative mixing was seen by age, gender and education, indicating a tendency of respondents to connect to contacts with similar characteristics. Random mixing was seen by reported number of daily contacts. Conclusions Despite methodological challenges (e.g. clustering among respondents and their contacts), applying RDS provides new insights in mixing patterns relevant for close-contact infections in real-world networks. Such information increases our knowledge of the transmission of respiratory infections within populations and can be used to improve existing modelling approaches. It is worthwhile to further develop and explore webRDS for the detection of clusters of respiratory symptoms in social networks.


PLOS ONE | 2014

Comparison of contact patterns relevant for transmission of respiratory pathogens in Thailand and The Netherlands using respondent-driven sampling

Mart L. Stein; Jim E. van Steenbergen; Vincent Buskens; Peter G. M. van der Heijden; Charnchudhi Chanyasanha; Mathuros Tipayamongkholgul; Anna Thorson; Linus Bengtsson; Xin Lu; Mirjam Kretzschmar

Understanding infection dynamics of respiratory diseases requires the identification and quantification of behavioural, social and environmental factors that permit the transmission of these infections between humans. Little empirical information is available about contact patterns within real-world social networks, let alone on differences in these contact networks between populations that differ considerably on a socio-cultural level. Here we compared contact network data that were collected in the Netherlands and Thailand using a similar online respondent-driven method. By asking participants to recruit contact persons we studied network links relevant for the transmission of respiratory infections. We studied correlations between recruiter and recruited contacts to investigate mixing patterns in the observed social network components. In both countries, mixing patterns were assortative by demographic variables and random by total numbers of contacts. However, in Thailand participants reported overall more contacts which resulted in higher effective contact rates. Our findings provide new insights on numbers of contacts and mixing patterns in two different populations. These data could be used to improve parameterisation of mathematical models used to design control strategies. Although the spread of infections through populations depends on more factors, found similarities suggest that spread may be similar in the Netherlands and Thailand.


Asia-Pacific Journal of Public Health | 2015

Factors influencing preventive behaviors for dengue infection among housewives in Colombo, Sri Lanka.

Charnchudhi Chanyasanha; Geethika Rathnawardana Guruge; Dusit Sujirarat

Dengue is an infectious disease prevalent in Sri Lanka. Some factors may influence preventive behaviors. This cross-sectional study aimed to determine the knowledge, attitude, and preventive behaviors associated with dengue and analyzed the factors influencing preventive behaviors among housewives in Colombo, Sri Lanka. The analytical study was designed, and data were collected using a structured questionnaire. The χ2 test and binary logistic regression were used to analyze data. The mean age of housewives was 39.41 years, 91% were married, 52% were Buddhist, and 46.5% had a family monthly income of 15 000 to 25 000 rupees. The knowledge of dengue preventive behaviors was 69.2%. The majority (91.5%) had a positive attitude toward dengue prevention. Only 39.3% used a mosquito net, and 89.3% had water storage container covers. Overall, 58.5% were knowledgeable about preventive measures. Age, religion, family income, education, knowledge, and attitude were associated with preventive behaviors. These findings are useful for dengue control in Colombo.


Southeast Asian Journal of Tropical Medicine and Public Health | 2008

CLINICAL FEATURES AND DIFFERENCES BETWEEN CHILD AND ADULT DENGUE INFECTIONS IN RAYONG PROVINCE, SOUTHEAST THAILAND

Shigeki Hanafusa; Charnchudhi Chanyasanha; Dusit Sujirarat; Indhira Khuankhunsathid; Arino Yaguchi; Tadashi Suzuki


Asian Pacific Journal of Allergy and Immunology | 1998

Seroprevalence of scrub typhus infection in patients with pyrexia at some malaria clinics in three western provinces of Thailand.

Charnchudhi Chanyasanha; Khanittha Kaeburong; Mongkol Chenchittikul; Dusit Sujirarat


Southeast Asian Journal of Tropical Medicine and Public Health | 2006

DUPLEX PCR-HYBRIDIZATION BASED DETECTION OF PATHOGENIC LEPTOSPIRA IN ENVIRONMENTAL WATER SAMPLES OBTAINED FROM ENDEMIC AREAS IN NORTHEAST REGION OF THAILAND

Unchalee Tansuphasiri; Chanchai Thipsuk; Duangporn Phulsuksombati; Charnchudhi Chanyasanha


Tropical Medicine and Health | 2004

INCIDENCE OF TRAVELERS’ DIARRHEA AMONG JAPANESE VISITING THAILAND

Yoshinori Mitsui; Charnchudhi Chanyasanha; Chaweewon Boonshuyar; Masaaki Shimada; Kazuhiko Moji


Southeast Asian Journal of Tropical Medicine and Public Health | 2005

An enrichment broth culture-duplex pcr combination assay for the rapid detection of enterotoxigenic Clostridium perfringens in fecal specimens

Unchalee Tansuphasiri; Charnchudhi Chanyasanha; Nattasai Cheaochantanakij


BMC Public Health | 2018

Factors associated with pneumococcal vaccination in elderly people: a cross-sectional study among elderly club members in Miyakonojo City, Japan

Akihiro Sakamoto; Charnchudhi Chanyasanha; Dusit Sujirarat; Nobuhiro Matsumoto; Masamitsu Nakazato


PLOS ONE | 2014

Correlations between recruiter and recruited contact.

Mart L. Stein; Jim E. van Steenbergen; Charnchudhi Chanyasanha; Mathuros Tipayamongkholgul; Vincent Buskens; Peter G. M. van der Heijden; Wasamon Sabaiwan; Linus Bengtsson; Xin Lu; Anna Thorson; Mirjam Kretzschmar

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Xin Lu

National University of Defense Technology

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