Ascariasis is an infection of the small intestine caused by the parasitic roundworm *Ascaris lumbricoides*. It is one of the most common human helminthic infections, particularly prevalent in tropical and subtropical areas with inadequate sanitation, primarily affecting children.
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*Ascaris lumbricoides* has been recognized since ancient times, with evidence of eggs found in archaeological sites dating back thousands of years. Hippocrates described the worms, and it was one of the first human parasites to be identified, providing early insights into hygiene-related diseases. Its widespread historical presence underscored the critical link between sanitation and public health.
Ascariasis spreads when a person ingests infective *Ascaris* eggs, which are found in soil contaminated with human feces. This primarily occurs through contaminated food (e.g., unwashed vegetables grown in contaminated soil), contaminated water, or unwashed hands that have come into contact with contaminated soil. The eggs are not immediately infective and require a maturation period in the soil before becoming capable of causing infection.
Contagious Period: Varies by disease
Local health department information and state-specific prevention guidance
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For official state health alerts, vaccination locations, and public health guidance specific to Florida, visit your state health department's website.
Whether you live in Florida or are traveling there, knowing the symptoms, timeline, and when to seek care helps you act quickly if exposure occurs.
Seek care if you experience severe dehydration, bloody stools, high fever, or symptoms lasting more than 3 days. Children under 5, adults over 65, and immunocompromised individuals should seek care earlier.
Emergency symptoms: Severe dehydration, inability to keep fluids down for 12 or more hours, or neurological symptoms require emergency care.
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Trusted information from leading health organizations
Official guidance from the U.S. Centers for Disease Control and Prevention
View CDC Resources βGlobal disease surveillance and guidelines from the World Health Organization
View WHO Resources βDisease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-07-18
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