It is a live vaccine which means it contains a weakened version of the chickenpox virus. As such, it is not recommended for those with a compromised immune system because of an illness like HIV or as a result of treatment such as chemotherapy.
"Cuba does not attack, nor threaten," Díaz-Canel added.
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The incident also comes almost 30 years to the day since Cuban defence forces shot down two small civilian planes belonging to Brothers to the Rescue, a US-based group that searched for rafts carrying migrants from Cuba to the US.
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