US embassy issues health alert for Cuba amid oil blockade, sanctions ↧ ↧ US embassy issues health alert for Cuba amid oil blockade, sanctions The U.S. embassy in Havana issued a health alert for Cuba on Friday, warning travelers and residents of a spike in ​intestinal illnesses and diarrhea caused by failing water and electricity supply, even ‌as the Trump administration continued to hold back fuel shipments necessary for power generation on the island.