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Less biodiversity, and the old and new diseases are global as epidemics

Cases of Lyme disease, transmitted by ticks (1983-1985): almost all (976) in Triveneto.
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risk of getting Lyme disease, and not only because of our environmental carelessness. Nemesis that touches us have for too long abused the Earth? But yes, after the tick bite us and suck the blood, enclosing the bacteria terrible, "on behalf of the ecosystem."
Study links the emergence of new diseases and the global spread of diseases once to changes in local biodiversity and the decline and extinction of species. The newsletter reports the latest issue of Science online . The destruction and loss of biodiversity, driven by the replacement of native species with alien species, deforestation, globalization of transport and other environmental changes may increase the incidence and spread of infectious diseases among men. And 'This is the conclusion reached by a study conducted by researchers at the University of Vermont and the Environmental Protection Agency published in the journal BioScience (Global Biodiversity Loss Affects Disease Ecology). "A number of new diseases is emerging and those that were once local are becoming global. Diseases such as West Nile Virus has spread worldwide very quickly "notes Joe Roman, one of the authors. This is not the first time that man has to face a barrage of new diseases. Even the transition from hunting to agriculture, domestication and the creation of permanent settlements led to a first "epidemiological transition." A later was dictated by the Industrial Revolution, with a decline of infectious diseases and the increase of cancer and allergies. Now, say the authors, we face yet once at a time like this. "This is the first work that links the current epidemiological transition to changes in biodiversity and the decline and extinction of species," says Montira Pongsiri, dell'EPA. "Molte persone hanno lavorato su questo argomento in relazione a singole malattie - dal West Nile virus alla malaria, dalla schistosomiasi agli hantavirus - ma nessuno ha raccolto tutti questi studi e li ha messi a confronto. Noi abbiamo analizzato tutti questi studi e mostrato che l'emergere o il riemergere di molte malattie è legato alla perdita di biodiversità. Guardando da un punto di vista più ampio a questo problema possiamo dire che non si tratta affatto di casi specifici. Sta accadendo qualcosa a scala globale", ha detto la Pongsiri. "Non stiamo dicendo che la perdita di biodiversità sia il fattore primario di tutte queste malattie emergenti, ma è evidente che ha un ruolo importante", ha detto Roman. "Prendiamo il caso della Lyme disease, transmitted by ticks infected with the bacterium Borrelia burgdorferi, "says Pongsiri." The tick receives the bacterium usually sucking the blood of small animals, especially in the United States from a small rodent, the white-footed peromisco. Historically, the disease was very rare because there was probably a wide range of different mammals. The tick fed on many of them, but because many are ill-suited to host a few ticks, the bacterium transmitted to humans. The reduction and fragmentation of forests and woodlands has led to a drastic decline in the number of mammals and the flourish of peromisco. So, the more it spreads peromisco in the woods, the greater the likelihood that the tick is infected, and then being bitten by an infected tick own.