North American scientist are studying West Nile virus and the way that birds populations can help to buffer people against infection. This study is also an interesting approach how biodiversity can provide a important service for the human people.
“Protecting biodiversity should be considered in public health and safety plans” as the author refers.
You can read more in here: Swaddle JP, Calos SE (2008) Increased Avian Diversity Is Associated with Lower Incidence of Human West Nile Infection: Observation of the Dilution Effect. PLoS ONE 3(6): e2488. doi:10.1371/journal.pone.0002488
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