Iraq obtained a sample of West Nile from US labs; Cuba probably obtained theirs long before since Cuba has long been involved in Africa in both warfare and in 'medicine.'
The interesting thing about Cuba is that it had a spy, Elena Montes, in our NSA for many years- since 1985; this spy was detected early in 2001 after the WASP spy network in Floida was tried and after another Cuban spy was found in the Miami INS office. Cuba's spy Montes was picked up after making some calls to her Cuban bosses from a DC payphone after September 11, 2001. The US also threw out some Cuban UN diplomats not over their fight with NY City policemen.
Recently the US threw two Iranian UN diplomats out of the country for espionage activities.
Another curiousity: two Afghans were caught in 1990 trying to deposit $2 million in a Cayman Islands bank after they had gotten off of a flight from Havana. These men are still stuck in the Caymans and are unable to leave because they have no real visas. They were detained by Cayman authorities for some time and the US interviewed them on Sept. 12, 2001.
Yet another curiousity: Libya has been making inroads in Caribbean nations, particularly Grenada, where not too long ago an Islamic group attempted a coup. One of those offenders has since been tangled up in a weapons smuggling ring in South Florida.
Also, Jamaat ul Fuqra and other Pakistani-related groups have operations in the Caribbean. The one group is tied directly to al Qaeda. It too has ties to Cuba.