There is no need for a vaccine. There are effective home and over the counter remedies.

Baking Soda for Coronavirus Remedy-

[Excerpts]

Coronavirus contamination is highly sensitive to pH... ... Severe metabolic acidosis and intracellular acidosis is reported one week after disease onset by 2019 novel coronavirus...

The correction of such acidosis could not be ignored in patients with COVID-19.

Novel coronavirus entry into host cells is pH dependent...

...sodium bicarbonate (NaHCO3) is an ideal choice of buffer system to maintain extracellular pH as it mimics the role of body’s own bicarbonate HCO3-.

Sodium bicarbonate, a lysosomo-tropic agent has been reported to be involved in neutralization of acidosis, thus it could be largely seen as a safer and easily available option for possible prophylactic and therapeutic interventions against

SARS-CoV-2 replication and pathogenesis...

In conclusion, in the current clinical emergency sodium bicarbonate seems to be the preferable way to increase pH as it has

been known as far back as the Spanish Flu pandemic of 1918 to save lives."

https://www.researchgate.net/publica...E_AND_COVID-19