Спрей в нос

От швейцарской компании, проходящий испытания Бентиро, AM-301- показал хорошие результаты для снижения заразности (и заражения) ковида.
Drug-free nasal spray as a barrier against SARS-CoV-2 infection: safety and efficacy in human nasal airway epithelia
В пробирке, на 3Д клеточной модели эпителия носа человека.
Клеткам не вредил, а титр вируса снижал  к 4 дню после заражения в опыте по сравнению с контролем,  на порядок, вплоть до 99% уменьшения (со времнем). По идее, спрей создает гелевый слой на слизистой носа, который служит дополонительным барьером для вируса (или еще чего, что может проникнуть внутрь или стимулирвоать иммунный ответ).
Надеюсь, дальнейшие испытания покажут еще более впечатляющие результаты.
Background: For SARS-CoV-2 and other respiratory viruses, the nasal epithelium is a key portal for infection. Therefore, the nose is an important target of prophylactic and therapeutic interventions against these viruses. We developed a nasal spray (AM-301, a medical device marketed as Bentrio) to protect against infection by SARS-CoV-2 and potentially other viruses. Aims of the study: To test the safety and efficacy of AM-301 against SARS-CoV-2 infection. Methods: AM-301 was tested on an in vitro 3D model of primary human nasal airway epithelium. Safety was assessed in assays for tight junction integrity, cytotoxicity and cilia beating frequency. Efficacy against SARS-CoV-2 infection was evaluated in prophylaxis and infection mitigation assays. Results: AM-301 did not have any detrimental effect on the nasal epithelium. Prophylactic treatment with AM-301 reduced viral titer significantly vs. controls over 4 days, reaching a maximum reduction of 99%. When treatment with AM-301 was started 24 or 30 h after infection, epithelia that received the formulation had a 12- or 14-fold lower titer than controls. Conclusion: AM-301 was found to be safe in vitro, and it significantly decelerated viral titer growth in experimental models of prophylaxis and mitigation. Its physical (non-pharmaceutical) mechanism of action, safety and efficacy pave the way for further investigation of its possible use against a broad spectrum of viruses, allergens and pollutants.