[Serological detection of malaria for people entering China from 19 ports of entry covering 8 border prefectures of Yunnan].
OBJECTIVE
To evaluate malaria situation in areas of Yunnan Province bordering with Myanmar, Laos and Vietnam.


METHODS
Blood samples on filter paper were collected from the entry people in March to December of 2007 involving 19 national and provincial ports of entry. Indirect fluorescent antibody test (IFAT) was carried out by using the blood samples collected before June 30 as the first half year and after July 1 as the second half year. Analysis was made on the relationship of IFAT positive rate and GMRT to malaria incidence in the province reported by the China information system for disease control and prevention.


RESULTS
IFAT positive rate in the first half year (5.6%) was 20.9% higher than that of second half year (4.4%) (chi2=12.95%, P<0.05). There was a positive correlation between IFAT positive rate and the number of malaria cases reported in 2007 from the 8 bordering prefectures (r=0.8124, P<.05). The highest IFAT positive rate was found in Dehong (8.7%), Baoshan (7.1%), and Lingcang (65%). Among the 19 entry ports, the highest IFAT positive rate was found in 5 entry ports: Lvliang, Laying, Jiegao, Houqiao, and Qingshuihe, all in China-Myanmar border. The IFAT positive rate in the Chinese entry people increased with their days of staying outside the border. Among the entry people, the highest antibody positive rate was from those of Myanmar nationality (11.7%) followed by those from Yunnan (3.7%).


CONCLUSIONS
To certain extent, higher malaria incidence outside the border impacts that of Yunnan Province.
Chen
Guo-wei
GW
Yunnan Institute of Parasitic Disease, Yunnan Center for Malaria Control, Simao 665000, China.
Wang
Jun
J
Huang
Xing-zhou
XZ
Li
Ya-ping
YP
Hou
Zhong-sheng
ZS
Li
Hua-xian
HX
Xu
Shi-yan
SY
Wei
Chun
C
Zhang
Zai-xing
ZX
D002681:China; D006801:Humans; D015994:Incidence; D008288:Malaria / Q000097:blood* / Q000453:epidemiology / Q000517:prevention & control*; D002052:Myanmar / Q000453:epidemiology; D011790:Quarantine / Q000706:statistics & numerical data*