What is the life cycle of a blood fluke?

Answer 1

Male deposits Sperm in the female worm. lays her eggs in the host. Egg leaves host in Urine and Feces. If egg lands in water infects snails. After they leave the snail, the young worms burrow into the skin of a new host, such as a human, while he or she is standing or swimming in water.

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Inside their human host, the blood flukes grow, become sexually mature, and mate. After mating, the newly fertilized eggs are passed out of the host in their feces. Upon leaving the host, each egg hatches into a ciliated, swimming larva, called miracidium. This larva infects a certain type of freshwater snail and reproduces asexually inside it. In time, fork-tailed swimming larvae develop and leave the snail, swimming about until they contact human skin. Upon finding a human host, the fork-tailed larvae burrow into their human host. Once inside, they migrate to the host’s intestinal veins and begin the cycle anew.

Answer 2

Schistosomes have a complex life cycle, in which cercariae, free-living in fresh water, can penetrate healthy human skin. The head of the cercaria transforms into an endoparasitic larva, the schistomule. The schistomules pass several days in the skin then enter the venous circulation and eventually migrate to the lungs (generally within 5 to 7 days of penetration). They then travel through the circulatory system to the heptoportal circulation (after fifteen days) where they mature into adult worms and mate. Depending on the species, the schistosomes migrate to their final infection site either on the bladder or the intestine where the females begin egg production. These eggs are attached the wall of the lumen. The eggs penetrate the wall of the lumen. They are then expelled in the feces or urine. The miracidium, liberated from the egg, seek out snail hosts where they enter a sporocyst stage that eventually results in free-living cercariae that seek out human hosts.

Answer 3

Flukes are a type of flatworm, called a trematode. The eggs pass from the host (i.e. human) with the feces. When the eggs reach water, they hatch into free-swimming forms called miracidia. The miracidia penetrate a snail or other molluscan host to become sporocysts. The cells inside the sporocysts typically divide by mitosis to form rediae. Rediae, in turn, give rise to free-swimming cercariae, which escape from the mollusk into the water. Using enzymes to burrow through exposed skin, cercariae penetrate another host (often an arthropod) and then encyst as metacercariae. When this host is eaten by the definitive host (the human, again), the metacercariae excyst and develop and the life cycle repeats

Answer 4

A blood fluke is another term for a schistosome - a parasitic worm of the genus Schistosoma.