"So far, we do not see any side effects in the nasal vaccine," the scientist quoted TASS as saying.
He also added that its effectiveness needs to be tested.
Gunzburg also warned that for allergy sufferers, like any drug, it can be dangerous at the stage of exacerbation of the disease.
“When there is no exacerbation ... there are no restrictions,” he said.
Earlier Gunzburg said that the coronavirus pandemic will end when 70-75% of the population will have the required amount of antibodies.