Life Cycle

• What is the mode of transmission (MOT) of Ascaris lumbricoides?

  Ingestion of EMBRYONATED EGGS
• What is the habitat of Ascaris lumbricoides?

  Small intestine
• What is the infective stage of Ascaris lumbricoides?

  Embryonated eggs
• What is the diagnostic stage of Ascaris lumbricoides?

  Adult worms, fertilized egg, and unfertilized egg
• Why do UNFERTILIZED EGGS exist?

  Lack of male worms present
• What is the definitive host of Ascaris lumbricoides?

  Humans
• What is the intermediate host of Ascaris lumbricoides?

  None
• How long does it take for an Ascaris lumbricoides to migrate from liver to lungs?

  14 days
• How long does the asymptomatic stage for Ascaris lumbricoides lasts?

  9-11 weeks
• What is the lifespan of Ascaris lumbricoides?

  1 year
• How many eggs does a female Ascaris lumbricoides lays per day?

  200,000 eggs
• Soil: plays a major role in the proliferation of A. lumbricoides
• How long does it take for an embryonated egg to be fertilized in the soil?

  2-3 weeks
• How long can they survive in moist and shaded soil?

  few months to 2 years
• What are the 3 parasites whose mode of transmission is the ingestion of embryonated eggs?

  Ascaris lumbricoides, Trichuris trichiura, and Enterobius vermicularis