Eating out, poor hand hygiene and erratic weather may be among causes, say medics
Additionally, passengers from some destinations will also need to take a PCR test on arrival at the Dubai airport.
According to information posted on the Dubai Airports website, the Covid-19 test must have been taken not more than 96 hours before departure. "Children under the age of 12 and those with moderate to severe disabilities are exempt from PCR test requirements," the airport operator said.
According to Emirates, a PCR Covid-19 test on arrival in Dubai will only apply to passengers from the following destinations:
Afghanistan
Armenia
Brazil
Bangladesh
Djibouti
Egypt
Eritrea
India
Indonesia
Iran
Iraq
Kazakhstan
Kyrgyzstan
Lebanon
Montenegro
Nigeria
Pakistan
Philippines
Russian Federation
Serbia
Somalia
South Africa
Sri Lanka
Sudan
Tajikistan
Tanzania
Turkmenistan
USA - Dallas Fort Worth (DFW), Houston (IAH), Los Angeles (LAX), San Francisco (SFO), Fort Lauderdale (FLL) and Orlando (MCO), including passengers originating from California, Florida and Texas connecting to an Emirates flight from any of our airports worldwide to Dubai.
Uzbekistan
Passengers undergoing the Covid-19 PCR test on arrival in Dubai must self-isolate until they receive their results. If their test result is negative, they can continue their trip; and if positive, they "must follow the advice of the Dubai Health Authority and stay in self-isolation".
"All other passengers can take a Covid-19 PCR test 96 hours before their flight and carry their printed negative test certificate with them when they travel," Emirates said. "You must bring a printed test certificate. A digital version on a phone will not be accepted."
The UAE's National Emergency, Crisis and Disaster Management Authority (NCEMA) had last week said passengers travelling to Dubai would need to have a Covid-negative certificate before flying in.
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