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Ascaris Life Cycle and Transmission

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Questions and Answers

What is the approximate lifespan of an adult worm of A. lumbricoides?

6-12 weeks

2-5 years

5-10 years

12-20 months (correct)

When do the gravid females of A. lumbricoides start laying eggs?

After 12-20 months

After 2 years

After 6-12 weeks (correct)

At birth

What is the primary cause of pathogenic effects of larval migration in ascariasis?

Presence of larvae in the lungs

Inflammation caused by larvae

Toxic secretions by larvae

Allergic reaction to larvae (correct)

What is the characteristic manifestation of ascaris pneumonia?

Low-grade fever Signup and view all the answers

What is the potential complication of ectopic ascariasis?

Obstructive appendicitis Signup and view all the answers

What is the characteristic feature of the sputum in ascaris pneumonia?

Blood-tinged Signup and view all the answers

What is the usual habitat of adult Ascaris lumbricoides?

Small intestines Signup and view all the answers

What is the distinctive feature of the male Ascaris worm?

Hook-shaped posterior end Signup and view all the answers

How many eggs can a single female Ascaris worm lay per day?

Up to 200,000 Signup and view all the answers

What is the difference between fertilized and unfertilized eggs of Ascaris?

Fertilized eggs are embryonated, while unfertilized eggs are not Signup and view all the answers

What is the length of the female Ascaris worm?

20-40 cm Signup and view all the answers

How many lips does the mouth of the Ascaris worm have?

3 Signup and view all the answers

What is the characteristic of an unfertilized egg of Ascaris?

It is elongated Signup and view all the answers

What is the natural host of Ascaris?

Man Signup and view all the answers

How is Ascaris infection usually transmitted?

Through contaminated food and water Signup and view all the answers

Where do the larvae of Ascaris develop and moult twice?

Lungs Signup and view all the answers

How do the larvae of Ascaris reach the alveoli?

They penetrate the lung capillaries Signup and view all the answers

Where do the larvae of Ascaris finally develop into adults?

Small intestine Signup and view all the answers