True. A substantial percentage of individuals infected with Giardia lamblia—estimated to be as high as 50% or more—never develop any symptoms. They become asymptomatic cyst passers or carriers. The factors determining whether an infection becomes symptomatic are not fully understood but likely involve a combination of parasite factors (e.g., the specific assemblage or strain), host factors (e.g., age, nutritional status, immune response, prior exposure), and possibly the infectious dose. Asymptomatic carriers are crucial from a public health perspective because they can unknowingly shed cysts into the environment for weeks or months, serving as reservoirs for ongoing transmission.

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Zambia

• ivwananji siwale – 29 pts

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