This isn&#x27;t the first dangerous disease spread by mosquitos, and may not be the last.  Not to mention how incredibly annoying they are in general.<p>I&#x27;ve been to Brazil a number of times, and the thing I could never understand is why, in a tropical country knee-deep in hungry disease causing mosquitos, is there not a single screen on any of the windows there?  Big mistake, they&#x27;re not expensive.  They are cheaper and safer than rubbing chemicals into your skin every day.<p>Here we have screens even in the desert where there are few mosquitos, they still keep out flies and moths, etc.