The virus is being locally transmitted by mosquitoes virtually throughout South America, Central America, Mexico and the Caribbean Islands Until this year, the many thousands of cases that have been diagnosed in the US were contracted elsewhere.
Os mosquitos transmiten o virus localmente practicamente por toda América do Sur,  América Central, México e as illas do Caribe. Ata este ano, os milleiros de casos diagnosticados nos EUA contraéronse noutra parte.