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  • Distribution is worldwide; prevalence is especially high in areas where standards of hygiene and sanitation are low or where human faeces are used as fertilizer
  • Prevalence and worm burden are higher in children than in adults
  • Ascaris (as other helminths) has an aggregated or negative binomial distribution in a population: this mean that there are many light infections and only few heavy infections
  • Per oral infection with embryonated eggs