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Michael Savage was talking about this last evening. He said the first case of WNV was in the Long Island NY area--close to where the UN is located--who's members have unobstructed diplomatic entry into the country. [Just supposition, of course.

The first cases of WNV in 1999 were in northern Queens -- not anywhere near the UN, which is in Manhattan. Of the 43 positive cases of WNV in New York City that year, 31 were Queens, eight from the Bronx, three from Brooklyn, and one from Manhattan. All of the four deaths occurred among persons age 75 years or older, and all four of those persons were residents of Queens.

What I'd like to know is why has a vaccine been developed for horses, but none for humans?

developing a vaccine is one thing.
Assuring it's efficacy is anoter matter entirely.
To date, Ft Dodge has not performed blind trial challanges to see just how "effective" their vaccine is. That is, how long does it offer protection from direct challange, an infected skeeter bite.
For people, that type of "protection" is unacceptable.
Also, at this time, there is no way to detect if the titer in the horse is from the vaccine or from the infection, so there is no way to screen to see if the animal has had exposure and is carring the virus, hence meticulus records have to be kept as to which animals received vaccine.
The vaccine has a conditional FDA license.