Reproductive outcomes in DDT applicators

Area of Science:

• Environmental Health
• Reproductive Toxicology
• Occupational Medicine

Background:

• Dichlorodiphenyltrichloroethane (DDT) is a persistent organic pollutant with known endocrine-disrupting properties.
• Previous studies have suggested potential links between DDT exposure and adverse reproductive effects, but evidence remains inconclusive.

Purpose of the Study:

• To investigate the relationship between occupational DDT exposure and reproductive outcomes in men.
• To assess effects on fertility, stillbirth rates, and offspring sex ratio.

Main Methods:

• A retrospective cohort study involving 105 men exposed to DDT during a 1946-1950 anti-malarial campaign in Sardinia.
• Reproductive histories of spouses were collected, including offspring sex distribution, time-to-pregnancy, spontaneous abortions, and stillbirths.
• Cumulative DDT exposure was retrospectively estimated based on campaign records.

Main Results:

• Elevated stillbirth rates and a reversed male/female offspring sex ratio were observed in DDT-exposed workers, especially applicators.
• Among DDT applicators, higher cumulative exposure correlated with increased stillbirth rates and decreased male/female ratios.
• No significant effects on the average number of children or abortion rates were found.

Conclusions:

• While limited by statistical power, findings suggest a potential association between heavy occupational DDT exposure and adverse reproductive outcomes, including stillbirths and altered offspring sex ratios.
• Further research is warranted to confirm these findings and explore the impact on male fertility.