|Roberto Morales. Photo: Juventud Rebelde|
Roberto Morales, Minister of Public Health, told the graduates they had "fulfilled their duty with honor."
The message said Castro recalled opening the institute 50 years ago "in response to the criminal action of the neighboring empire, which took most of 6,000 available to the country at the time with promises of employment."
Prensa Latina reported the story, which followed recent rumors of Castro's demise. The former Cuban president hasn't been seen in public since March.
Not everyone believes Castro is still alive.
"He's dead and that's it," Miami radio commentator Nelson Rubio said on Facebook after seeing the latest report.
On Oct. 18, ABC newspaper quoted Venezuelan doctor José Rafael Marquina as saying Castro had suffered a cerebral embolism - a stroke. None of this information has been confirmed.