Blood tests (for antibody) are used to screen for H.pylori. They remain positive for many months after treatment so can only be used as the initial test. Urine antibody is a "pregnanacy style" urine test. Accuracy is slightly less than blood tests. A negative blood test is good evidence that Hp is NOT present. Use it to exclude the diagnosis (but no test is 100% perfect remember).
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it is possible to be co-infected by multiple H. pylori strains or even helicobacter species. Many years ago, we found several strains from a single patients. In fact, it is more common than most people know. It is still not very well understood how the whole thing work. Because H. pylori is a very fast mutating organism. Most of the time, they combine and become a new strain.