Objective: To determine the prevalence of malaria infections among foreign migrant workers
in Thailand.
Methods: Giemsa-stained thin and thick blood films were prepared from blood
samples of 294 foreign migrant workers recruited in the study. Microscopic examination of these
blood films was performed for malaria detection.
Results: Blood film examination revealed
1.36% malaria infections in these 294 subjects. All positive cases were male Myanmar workers
in which their blood films only ring stage of Plasmodium spp. was found at low parasite density
(mean= 144 parasites/毺L of blood). The prevalence of malaria infections was not significantly
different among foreign migrant workers classified by age, gender, and resident province (P>0.05).
Thin blood films of these workers also showed 78.91% hypochromic erythrocytes and 61.9%
relative Eosinophilia.
Conclusions: These findings indicate a high risk of malaria transmission.
Therefore active malaria surveillance by using molecular methods with more sensitive and
specific than microscopy should be considered for malaria control in foreign migrant workers.