Hi Donald, dengue fever is a problem anywhere there are mosquitoes, including in the U.S. It is worse during the rainy season, of course, and along coastal areas. (No problems in the Sierras.)
The best way to protect yourself is to not allow any standing water on your property. And to hope your neighbors do the same. Every government health department has education programs about this and they often go door to door offering information and checking for problems. And certainly, if you have a neighbor who is not keeping their property in order, you can call and report them to the health department who will come and do an inspection.
You should also take personal precautions — have screens on your windows, use repellant judiciously and/or wear long sleeves and long pants and socks.
Learn more at http://www.cdc.gov/dengue/resources/30jan2012/aegyptifactsheet.pdf
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