If it IS true that neighboring villages have their own parasites, then the situation has changed. Natsumi may have a strain of parasite that is different (mutated?) from the original strain that causes what we call Hinamizawa Syndrome. If so, then there's no telling what changes could result.
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Not just everyone who lives in this village, people like our relatives who live in Okinomiya are included too.
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Okinomiya is still outside of the mountain valley where Hinamizawa is located. Since this valley is apparently the only area that is suitable for breeding the parasites, I believe that any parasites which lead to Syndrome are completely localized. The relatives in Okinomiya would have all originally come from Hinamizawa, and since there is no proof that the parasites can jump from person to person, different villages cannot have their own versions of the disease.