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Seroepidemiology and risk factors for sporadic norovirus/Mexico strain

Anne E Peasey1, Guillermo M Ruiz-Palacios, Maria Quigley

  • 1Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, United Kingdom. a.peasey@public-health.ucl.ac.uk

The Journal of Infectious Diseases
|May 15, 2004
PubMed

Insights

Sporadic norovirus (NV) transmission in rural Mexico is linked to hygiene and domestic factors. Factors like hand washing, household cleanliness, and proximity to dogs or agricultural activities influence NV infection risk.

Area of Science:

  • Epidemiology
  • Infectious Diseases
  • Public Health

Background:

  • Norovirus (NV), previously known as Norwalk-like virus, is a significant cause of gastroenteritis globally.
  • Understanding risk factors for sporadic NV transmission is crucial for developing targeted prevention strategies.
  • Previous research has primarily focused on NV outbreaks, with less data available on sporadic infections.

Purpose of the Study:

  • To identify and characterize risk factors associated with the transmission of the Mexico strain of sporadic norovirus (NV).
  • To investigate the relationship between demographic factors, hygiene practices, and NV infection in a rural Mexican population.
  • To provide initial evidence on factors influencing sporadic NV acquisition.

Main Methods:

  • A seroepidemiological study was conducted in rural Mexico.
  • IgA antibody levels against the Mexico strain of norovirus were measured in participants of different age groups.
  • Statistical analyses were performed to identify associations between seropositivity/seroresponse and various risk factors, including hygiene, domestic environment, and maternal activities.

Main Results:

  • Norovirus (NV) IgA antibody acquisition was significantly age-related, with higher seropositivity in adults (81%) compared to young children (34%).
  • A higher seroresponse rate to the Mexico strain was observed in 1-4-year-olds (42%) compared to adults (27%) after 12 months.
  • Key risk factors identified included personal and domestic hygiene (e.g., hand washing, mother's clothing cleanliness, cooking area type), presence of dogs in the home for infants, and maternal involvement in agricultural activities for older children.

Conclusions:

  • Personal and domestic hygiene practices are significantly associated with norovirus (NV) seroresponse in rural Mexico.
  • Specific environmental and behavioral factors, such as household pets and maternal occupation, represent distinct risk factors for NV infection in different age groups.
  • The findings offer valuable insights into the transmission dynamics of sporadic norovirus (NV) and share similarities with factors implicated in NV outbreaks.

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