Mario, interesting point to remind us that human beings are carriers of disease, too; but I am not sure the overall point is right. Certainly the disease vectors for humans are intensified by having a human monoculture/wetland cycle around, but wetlands are very high-productivity, high diversity ecosystems anyway so they naturally have a lot more happening in them than in other ecosystems -- bird malaria, parasitical diseases and others -- nothing to do with humans.
yours, Peter T.