These companies are working in collaboration with Dubai Land Department to offer free services to areas affected by the storm
But the scientists tweaked the adenovirus, rendering it unable to cause illness.
The harmless adenovirus carries the spike protein into the nose, enabling the body to mount an immune defence against the Sars-CoV-2 virus without becoming sick.
In another innovation beyond nasal delivery, the new vaccine incorporates two mutations into the spike protein that stabilise it in a specific shape that is most conducive to forming antibodies against it.
The researchers compared this vaccine administered to the mice in two ways -- in the nose and through intramuscular injection.
While the injection-induced an immune response that prevented pneumonia, it did not prevent infection in the nose and lungs.
Such a vaccine might reduce the severity of Covid-19, but it would not totally block infection or prevent infected individuals from spreading the virus.
In contrast, the nasal delivery route prevented infection in both the upper and lower respiratory tract -- the nose and lungs -- suggesting that vaccinated individuals would not spread the virus or develop infections elsewhere in the body.
The researchers said the study is promising but cautioned that the vaccine so far has only been studied in mice.
"In these mouse models, the vaccine is highly protective and we're looking forward to beginning the next round of studies," the study authors wrote.
These companies are working in collaboration with Dubai Land Department to offer free services to areas affected by the storm
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