For entry into Singapore, to stop and prevent diseases related to yellow fever, Government of Singapore recommends all Airlines flying to Singapore must comply with strict quarantine requirements for passengers have been in or have passed through any country at risk of yellow fever within the preceding six days. All information related to yellow fever and countries at risk of yellow fever are provides updates on the Singapore government website under the link: https://www.ica.gov.sg/page.aspx?pageid=95