The Center for Disease Control has issued a travel warning for an area north of the downtown Miami area (Fox News). The affected terrain covers one square mile and encompasses the trendy Wynwood, Midtown and Edgewater neighborhoods. Pregnant women are urged to take stringent precautions against the mosquitoes which carry the Zika virus, which is linked to severe birth defects. The governments of Ireland and Great Britain have issued similar alerts. In listening to the story, I was struck by the assertion that mosquitoes are not likely to travel more than 200 meters from the target zone and that downtown is safe. Really, can they be sure of that? Stay alert, travelers!