Transmission of Ascaris lumbricoides
Describe the mode of transmission of Ascaris lumbricoides.(7marks)
Suggested resposponses
Infection occur when one swallows eggs with the infective larvae;
In the alimentary canal the egg case breaks to release the larva;
Larvae penetrates intestinal wall and enter the blood stream;
They migrate to the liver then to the heart and eventually into the lungs;
In the lungs, they moult twice and then migrate...
