Human malaria mainly caused by four

Human malaria mainly caused by four species of Plasmodium
(P. falciparum, P. vivax, P. malariae and P.
ovale) affects approximately 350–500 million people
worldwide annually1. It is a major public health problem
in tropical and subtropical areas, particularly in developing
countries in Southeast Asia region2. High rate of malaria
transmission with low parasitaemia in these areas is
relevant to asymptomatic malaria carriers3. In Thailand,
the increase of immigration from Thailand-Myanmar and
Thailand-Cambodia borders where malaria is endemic has
been a significant health risk in migrant workers and Thai
people4. Lack of epidemiological data, especially the prevalence
of malaria among foreign migrant workers, the impact
of the situation on public health could not be determined.
Until now, laboratory screening for Plasmodium
infections has not been included in the health-screening
program for migrants in Thailand