The latest foreign trip comes less than a month after the Duke and Duchess of Sussex visited Australia, New Zealand, Fiji and Tonga.
In October, Public Health England warned pregnant women not travel to a region of India amid fears they could be struck down with Zika.
Zika can cause microcephaly for children in the womb, causing babies to be born with abnormally small skulls.
What is Zika?
• The Zika virus is spread by mosquito bites, between people during unprotected sex, and from pregnant mothers to their children.
• It cannot be cured or prevented with medicines. Although most adults do not become seriously ill from the infection, it can cause serious birth defects if pregnant women get it.
• Foetuses' brains can be affected by the virus when it is passed on from the mother and it can cause microcephaly.
• Microcephaly is a condition in which babies' heads are unusually small, which can lead to seizures, delayed development and other disabilities.
• The virus can also increase the risk of unborn children developing Guillain-Barre syndrome – an uncommon illness in which the immune system attacks the nerves and can cause muscle weakness and paralysis.