Quantitative Microbial Risk Assessment of Pediatric Infections Attributable to Ingestion of Fecally Contaminated Domestic Soils in Low-Income Urban Maputo, Mozambique.
Environ Sci Technol
; 55(3): 1941-1952, 2021 02 02.
Article
em En
| MEDLINE
| ID: mdl-33472364
ABSTRACT
Rigorous studies of water, sanitation, and hygiene interventions in low- and middle-income countries (LMICs) suggest that children are exposed to enteric pathogens via multiple interacting pathways, including soil ingestion. In 30 compounds (household clusters) in low-income urban Maputo, Mozambique, we cultured Escherichia coli and quantified gene targets from soils (E. coli ybbW, Shigella/enteroinvasive E. coli (EIEC) ipaH, Giardia duodenalis ß-giardin) using droplet digital PCR at three compound locations (latrine entrance, solid waste area, dishwashing area). We found that 88% of samples were positive for culturable E. coli (mean = 3.2â¯log10 CFUs per gram of dry soil), 100% for molecular E. coli (mean = 5.9â¯log10 gene copies per gram of dry soil), 44% for ipaH (mean = 2.5â¯log10), and 41% for ß-giardin (mean = 2.1â¯log10). Performing stochastic quantitative microbial risk assessment using soil ingestion parameters from an LMIC setting for children 12-23 months old, we estimated that the median annual infection risk by G. duodenalis was 7100-fold (71% annual infection risk) and by Shigella/EIEC was 4000-fold (40% annual infection risk) greater than the EPA's standard for drinking water. Compounds in Maputo, and similar settings, require contact and source control strategies to reduce the ingestion of contaminated soil and achieve acceptable levels of risk.
Texto completo:
1
Coleções:
01-internacional
Contexto em Saúde:
2_ODS3
/
3_ND
Base de dados:
MEDLINE
Assunto principal:
Solo
/
Escherichia coli
Tipo de estudo:
Etiology_studies
/
Risk_factors_studies
Aspecto:
Determinantes_sociais_saude
Limite:
Child
/
Child, preschool
/
Humans
/
Infant
País/Região como assunto:
Africa
Idioma:
En
Revista:
Environ Sci Technol
Ano de publicação:
2021
Tipo de documento:
Article