Abstract
Background: Reliable information on mobility patterns of migrants is a crucial part of the strategy to contain the
spread of artemisinin-resistant malaria parasites in South-East Asia, and may also be helpful to efforts to address
other public health problems for migrants and members of host communities. In order to limit the spread of
malarial drug resistance, the malaria prevention and control programme will need to devise strategies to reach
cross-border and mobile migrant populations.
Methodology: The Respondent-driven sampling (RDS) method was used to survey migrant workers from
Cambodia and Myanmar, both registered and undocumented, in three Thai provinces on the Thailand-Cambodia
border in close proximity to areas with documented artemisinin-resistant malaria parasites. 1,719 participants (828
Cambodian and 891 Myanmar migrants) were recruited. Subpopulations of migrant workers were analysed using
the Thailand Ministry of Health classification based on length of residence in Thailand of greater than six months
(long-term, or M1) or less than six months (short-term, or M2). Key information collected on the structured
questionnaire included patterns of mobility and migration, demographic characteristics, treatment-seeking
behaviours, and knowledge, perceptions, and practices about malaria.
Results: Workers from Cambodia came from provinces across Cambodia, and 22% of Cambodian M1 and 72% of
Cambodian M2 migrants had been in Cambodia in the last three months. Less than 6% returned with a frequency
of greater than once per month. Of migrants from Cambodia, 32% of M1 and 68% of M2 were planning to return,
and named provinces across Cambodia as their likely next destinations. Most workers from Myanmar came from
Mon state (86%), had never returned to Myanmar (85%), and only 4% stated plans to return.
Conclusion: Information on migratory patterns of migrants from Myanmar and Cambodia along the malaria
endemic Thailand-Cambodian border within the artemisinin resistance containment zone will help target health
interventions, including treatment follow-up and surveillance.
AbstractBackground: Reliable information on mobility patterns of migrants is a crucial part of the strategy to contain thespread of artemisinin-resistant malaria parasites in South-East Asia, and may also be helpful to efforts to addressother public health problems for migrants and members of host communities. In order to limit the spread ofmalarial drug resistance, the malaria prevention and control programme will need to devise strategies to reachcross-border and mobile migrant populations.Methodology: The Respondent-driven sampling (RDS) method was used to survey migrant workers fromCambodia and Myanmar, both registered and undocumented, in three Thai provinces on the Thailand-Cambodiaborder in close proximity to areas with documented artemisinin-resistant malaria parasites. 1,719 participants (828Cambodian and 891 Myanmar migrants) were recruited. Subpopulations of migrant workers were analysed usingthe Thailand Ministry of Health classification based on length of residence in Thailand of greater than six months(long-term, or M1) or less than six months (short-term, or M2). Key information collected on the structuredquestionnaire included patterns of mobility and migration, demographic characteristics, treatment-seekingbehaviours, and knowledge, perceptions, and practices about malaria.Results: Workers from Cambodia came from provinces across Cambodia, and 22% of Cambodian M1 and 72% ofCambodian M2 migrants had been in Cambodia in the last three months. Less than 6% returned with a frequencyof greater than once per month. Of migrants from Cambodia, 32% of M1 and 68% of M2 were planning to return,and named provinces across Cambodia as their likely next destinations. Most workers from Myanmar came fromMon state (86%), had never returned to Myanmar (85%), and only 4% stated plans to return.Conclusion: Information on migratory patterns of migrants from Myanmar and Cambodia along the malariaendemic Thailand-Cambodian border within the artemisinin resistance containment zone will help target healthinterventions, including treatment follow-up and surveillance.
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