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There is no transplant for Crohn's disease. (The large intestine is never transplanted since you can live without it. The small intestine can be transplanted, but it does not cure Crohn's disease).
The only transplanted tissues that house enough immune cells to cause graft vs. host disease are the blood and the bone marrow.
Scientists have no factual evidence regarding the incubation period for Parkinson's disease. Some believe it can build up over a lifetime while others think there is no incubation period.
Tuberculosis
It is present in all cases of the disease
It is present in all cases of the disease
Scientists believe stem cells from human embryos could hold the key to treatments and cures for disease. Basically it is a debate about stem cell research.
Because they forget
Schizophrenia is a biological disease of the brain.
This is under a lot of speculation yet. Some scientists believe it came from a cow: others say it originated from a sheep. But there is no definite answer.
Organs get transplanted due to disease or deformity. So if a person's heart started to fail due to disease, they may be eligible for a new heart if any are available and have the correct blood type.
They thought that rodents start the disease, because they can move and spread fleas.