Prenatal Mancozeb Exposure, Excess Manganese, and Neurodevelopment at 1 Year of Age in the Infants' Environmental Health (ISA) Study

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift


BACKGROUND: Although growing evidence suggests that early-life excess manganese (Mn) impairs neurodevelopment, data on the neurodevelopmental effects of mancozeb, a fungicide containing Mn, and its main metabolite ethylenethiourea (ETU) are limited. OBJECTIVE: We examined whether prenatal mancozeb exposure and excess Mn were associated with neurodevelopment in 355 1-y-old infants living near banana plantations with frequent aerial mancozeb spraying in Costa Rica. METHODS: We measured urinary ETU, hair Mn, and blood Mn concentrations in samples collected 1-3 times during pregnancy from mothers enrolled in the Infants' Environmental Health (ISA) study. We then assessed neurodevelopment in their 1-y-old infants using the Bayley Scales of Infant and Toddler Development, 3rd edition (BSID-III). We estimated exposure-outcome associations using linear regression models adjusted for maternal education, parity, gestational age at birth, child age, Home Observation for Measurement of the Environment score, and location of neurodevelopmental assessment. RESULTS: Median (P25-P75) urinary ETU, hair Mn, and blood Mn measured during pregnancy were 3.3 μg/L (2.4-4.9; specific gravity-corrected), 1.7 μg/g (0.9-4.1), and 24.0 μg/L (20.3-28.0), respectively. Among girls, higher ETU was associated with lower social-emotional scores [β per 10-fold increase=-7.4 points (95% CI: -15.2, 0.4)], whereas higher hair Mn was associated with lower cognitive scores [-3.0 (-6.1, 0.1)]. Among boys, higher hair Mn was associated with lower social-emotional scores [-4.6 (-8.5, -0.8)]. We observed null associations for blood Mn, language, and motor outcomes. CONCLUSIONS: Our findings indicate that maternal exposure to mancozeb and excess Mn during pregnancy may have adverse and sex-specific effects on infant neurodevelopment.


  • Ana María Mora
  • Leonel Córdoba
  • Juan Camilo Cano
  • David Hernandez-Bonilla
  • Larissa Pardo
  • Lourdes Schnaas
  • Donald R. Smith
  • José A. Menezes-Filho
  • Donna Mergler
  • Christian H. Lindh
  • Brenda Eskenazi
  • Berna van Wendel de Joode
Enheter & grupper
Externa organisationer
  • University of California, Berkeley
  • National University Of Costa Rica
  • National Institute of Public Health, Mexico
  • University of California, Santa Cruz
  • Federal University of Bahia
  • Université du Québec à Montréal
  • National Institute Of Perinatology (INPer)

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Pediatrik
  • Miljömedicin och yrkesmedicin
TidskriftEnvironmental Health Perspectives
StatusPublished - 2018 maj
Peer review utfördJa