Giardia lamblia is a classic waterborne pathogen, and its cysts are highly resistant to environmental stress and standard chlorine levels used in water treatment. In remote camping or wilderness areas, the most common source of giardiasis outbreaks is untreated surface water from streams, rivers, or lakes. These water sources can be contaminated upstream by animal reservoirs (like beavers, hence the nickname 'beaver fever') or by human fecal matter from inadequate sanitation. Campers who drink directly from these sources or use untreated water for cooking and cleaning are at high risk. While person-to-person transmission (B) is common in daycare centers, and food (C) can be a vehicle, water is the dominant source in such outdoor settings. Contaminated soil (D) is more relevant for geohelminths like hookworm.

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Zambia

• loveness Phiri – 1084 pts

• Visual Pathway Lesions
• Positive and Negative Symptoms
• Hallucinations and Delusions
• Antipsychotic Medications
• Emergency: Environmental Emergencies