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Scientists work on nasal spray that could stop Covid virus replicating.The Substance has had promising results in ferrets, with hopes it may reduce transmission

scientists have released the results of initial work on a drug-like molecule they say interacts with cells in the nasal cavity to activate the body’s innate immune system.
A nasal spray is under development that could nip a coronavirus infection in the bud, with promising results already seen in ferrets, researchers have revealed.

Five days after the ferrets were exposed to the coronavirus, the quantity of viral RNA – the genetic material of the virus – recovered from throat swabs was reduced by 96% among those given INNA-051 compared with those given the placebo.

https://www.theguardian.com/world/2020/sep/28/scientists-work-on-nasal-spray-that-could-stop-covid-virus-replicating