Parasite

Question 1

Answer 1

Question 2

Giardiasis Life Cycle and Transmission

Answer 2

Giardiasis Life Cycle and Transmission
Giardia lamblia

Cysts spread by the fecal-oral route

• Food or water supplies
• person-to-person
• One animal reservoir: ‘Beaver fever’ •

Common in campers, groups of children, travelers returning from abroad

Prevalence in the developing world may be as high as 10%.

Cysts

• survive more than 2 months in cold water
• resistant to chlorine

Question 3

Giardiasis Diagnosis

Answer 3

Giardiasis Diagnosis
O&P; microscopy

• Cysts: 11-14 µm, oval, 4 nuclei
• Trophs: 12-15 µm, pear-shaped, 2 nuclei

Antigen detection

Trophozoites may be obtained using the Enterotest kit or by duodenal aspiration, and detected in wet mounts

Question 4

Answer 4