Mymetics Corp (MYMX)

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Nasal vaccine against COVID-19 prevents infection in mice

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.

https://www.sciencedaily.com/releases/2020/08/200821155747.htm

A single-dose intranasal ChAd vaccine protects upper and lower respiratory tracts against SARS-CoV-2

https://www.researchgate.net/publication/343755641_A_single-dose_intranasal_ChAd_vaccine_protects_upper_and_lower_respiratory_tracts_against_SARS-CoV-2