What is Zika?
Zika is a disease caused by a virus transmitted by the Aedes mosquito. It was first detected in Zika Forest in Uganda in 1947 in a rhesus monkey, and in the Aedes africanus mosquito in 1948.
Its incubation period is likely to be a few days and the symptoms are similar to those of other mosquito-borne diseases such as dengue and chikungunya: fever - rashes, conjunctivitis, muscle and joint pain, malaise and headache.
Zika has been linked to instances of Guillain-Barre syndrome - a rare disorder that causes muscle weakness and temporary paralysis.
It has also been linked to microcephaly, a rare condition in which babies are born with abnormally small heads.
There are currently no vaccines or drugs for Zika, as the disease was rare and mild until last year.
Those infected are usually advised by doctors to get plenty of rest and drink lots of fluids, while pain and fever are treated with available medicines.
Sources: World Health Organisation, Centres for Disease Control and Prevention
Yesterday, the Singapore National Olympic Council sent out a statement saying that the 25-member team of athletes and officials who represented Singapore at the recent Rio Olympics were not affected by the Zika virus.
"The athletes and officials of the Rio 2016 Olympic Games Team Singapore contingent have returned to Singapore safe and symptom-free from Zika," said Mr Low Teo Ping, chef de mission for Team Singapore.
"We are keeping a close tab on the athletes and officials, monitoring them for symptoms such as fever, skin rash, headache, fatigue, muscle pain, and joint pain for three weeks upon their return.
"We have also advised them to continue to apply insect repellent and wear long-sleeved clothing where possible and to avoid travel to multiple places in a day.
"Any occurrence and non-occurrence of symptoms are updated to the team doctor daily."