Demographical data and the Plasmodium infection status of 294 foreign workers (92 females and 202 males) were described in Table 1. The age range of the participants was 9-46 years (median = 26 years). These subjects were mainly Myanmar , followed by Cambodian and Laos The results showed the overall prevalence of malaria infections in foreign migrant workers was 1.36% (4/294). Of 265 Myanmar migrant workers, 1.5% was infected with malaria parasites. Only ring stages was found in the positive blood films with low parasitemia (range = 64 - 224; mean = 144 parasites/μL). A single of either thin or thick blood films were positive for malaria in 0.34% (1/294), and 1.02% (3/294), respectively. Both a thin blood film together with a thick blood films and double thick blood films detected 4 positive samples (1.36%).