Hello Bex,

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True, some are carriers. But if what you say is true and we share more diseases with the great apes than any other animal and there really is very little differences in their handling of these diseases (compatiblity goes both ways), then there should be no issue with using their organs and no unpleasant surprises.
No, because not only do they have different diseases, they have evolved antigens to those diseases that we do not have and vice versa. This is why the indians died in such numbers after the americas were discovered by europeans: they did not have the antigens to the diseases that the europeans carried.

There is even less difference (Homo sapien european to Homo sapien indian) than between Homo sapien and chimp, but it was deadly.

When you transplant an organ, you can transplant a disease, but not the antigens to fight it. The antigens come from your own white cell system and they will not recognize foreign antigens as friends, nor will you have any way to reproduce those antigens. If you do a bone marrow transplant and replace the immune system with cells from another person, and then turn out to be incompatible, the immune system will reject you.

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One must also ask about our apparent "common ancestor" and whether they had the capacity for speech and why did this capacity turn up in us and not the primates? Yet still we are claimed to be from the same ancestor.
That would be a trait that evolved after the two populations diverged from the common ancestor population. Evolution continues in each and every population, even after speciation has occurred. It doesn't stop because there are two reproductively isolated populations.

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No matter how much evolution one throws on everything, animals have remained animals and there is a clear difference between all animals/creatures and human beings. We are fully aware of them and pretending one believes we are equal is lying. If in fact we are all equal, then how is it we have rights to retain/contain them, cage them, shoot them, eat them, ride them, use them, choose them as pets, use them in different areas of work depending on their suitability, do experiments on them, etc.....There is no doubt that even if you believe in evolution, man is the only creature that stands out and above every other creature.
No, there is not a clear difference, there are differences of degree, but not of whole different categories. Yes, it becomes difficult to look at baby apes playing with snowballs ...
http://majorlycool.com/media/1/snow-monkeys/japanese-macaque-with-snowball.jpg
(more from google images)
... and not feel kinship.

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E.g. the speech of a parrot etc. This does not mean that humans evolved from birds, but supports that there are some striking traits within animals that are hard to ignore.
Or that there are equally striking traits in other animals.

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If indeed there really is a "common ancestor" then from where did they come and how? And where is the proof of their evolutionary arrival on the stage?
And that is the great part of science - asking questions and then seeing if you can find the answers.

For instance we can compare the DNA of humans and chimps (both have been sequenced) and we find curious things, like the fact that both have the same mutation in the same spot on the same gene that disables our ability to make our own vitamin C. Other primates that evolved from earlier common ancestors have this gene without the mutation. By using this kind of genetic information you can create a phylogenic tree that shows who is related to who and when, relatively, they branched off from the various common ancestors.

If there is no common ancestor relationship then there is no reason for these similar traits (the same damaged gene in exactly the same spot).

The curious thing is that when the geneticists started doing these comparisons, time and again they matched the phylogenic trees that had been developed since Lineaus (before Darwin) and based on the visible hereditary traits in the skeletons.

Two independent methods, same result.

And these phylogenic trees have intermediates.

Enjoy.