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Exploration of different methods for measuring DDT exposure among malaria vector-control workers in Limpopo Province, South Africa.

Abstract：

:DDT compounds are used in many developing countries, including South Africa, for the control of malaria vectors. This study investigated biological exposures among workers in relation to job history. A cross-sectional study of 59 workers at the Malaria Control Centre (MCC) in Tzaneen, South Africa, was performed. Tests included a job history questionnaire and the measurement of serum o'p' and p'p' isomers of DDE, DDT, and DDD, corrected for serum total lipids. Forty-seven (80%) workers donated a blood sample for the determination of serum DDT. The mean number of years worked at the MCC (malaria years) was 15.8+/-7.8 years and the mean serum DDT was 94.3+/-57.1 microg/g of lipid. There were no significant associations between short-to-medium-term serum DDT exposure measures (o'p'-DDE and o'p' and p'p' isomers of DDD and DDT) and malaria years. The long-term exposure measure, p'p'-DDE, was significantly associated with malaria years (beta=3.0+/-1.2 microg/g lipid/year; P=0.001; n=47; adjusted for age), but only 27% variance of p'p'-DDE was explained. Blood total DDT uncorrected for lipid content was strongly related to corrected levels (B=0.74+/-0.48, P=0.00, R2=0.77), but uncorrected p'p'-DDE had a weaker association (B=0.0024+/-0.0013, P=0.074; R2=0.53) with malaria years than did corrected levels (beta=0.042+/-0.017; P=0.016; R2=0.56). The results show that serum DDT levels for malaria vector-control workers in South Africa with a long-term spraying history are high. Job history information on DDT exposures must be very detailed in order to provide valid estimates of exposure.

journal_name

Environ Res

journal_title

Environmental research

authors

Dalvie MA,Myers JE,Thompson ML,Robins TG,Omar S,Riebow J

doi

10.1016/j.envres.2003.09.004

subject

Has Abstract

pub_date

2004-09-01 00:00:00

pages

20-7

issue

1

eissn

0013-9351

issn

1096-0953

pii

S0013935103001774

journal_volume

96

pub_type

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