This question tests understanding of the function of Giardia's VSPs. VSPs cover the entire surface of the trophozoite and are the major antigens exposed to the host immune system. They undergo antigenic variation, allowing the parasite to evade host antibody responses. In a germ-free mouse model (no competing flora), infection dynamics can be observed clearly. A strain lacking VSPs would have a constant, non-varying surface antigen profile. Prediction 1: The host would mount a strong, specific antibody response against these constant surface antigens. Prediction 2: Because the parasite cannot switch antigens, this antibody response would be highly effective at agglutinating and clearing the parasites, likely leading to a shorter duration of infection and possibly lower peak parasite burdens. The infection might be self-limiting. In contrast, wild-type Giardia, by switching VSPs, can repeatedly escape antibody-mediated clearance, leading to chronic infection. The VSPs are not primarily involved in attachment (that's the ventral disc) or nutrient uptake, so initial colonization might be similar. The key difference is in the adaptive immune response and clearance.

Break down complex topics into smaller, manageable chunks for easier recall.

Zambia

• Joseph Soko – 101 pts

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