The CIA released Swine Fever in Cuba in 1971, unlike the Swine Flu it can not be transmitted to humans. This 1977 San Fransisco Chronicle article lays it all out.
“With at least the tacit backing of U.S. Central Intelligence Agency officials, operatives linked to anti-Castro terrorists introduced African swine fever virus into Cuba in 1971…”
This article by Nessie of the SF Bay Guardian covers that incident and some of the other weird stuff the CIA did to Cuba in the 60s and 70s. I don’t even want to get into the theory that CIA agents who were angry over Kennedy’s moderately low emphasis on Cuba were the ones who arranged to shoot him, E Howard Hunt etc.