Don't know if you read the article but the trial was VERY small.....
"In the study, the spray was given to six ferrets, which were then divided into pairs and placed in three cages. Into each cage also went two ferrets that had been given a placebo spray and one ferret that had been deliberately infected with SARS-CoV-2 a day or two earlier.
Ferrets are used by scientists studying flu, SARS and other respiratory diseases because they can catch viruses through the nose much as humans do, although they also infect each other by contact with feces or by scratching and biting.
After 24 hours together, none of the sprayed ferrets caught the disease; all the placebo-group ferrets did.
“Virus replication was completely blocked,” the authors wrote."
....too small to draw any firm conclusions, but it doesn't get any better than 100% effective.
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