Methylene Blue

[George K]

I was unaware that methylene blue is used in conjunction with cancer therapies.

https://guerir-du-cancer.fr/a-cohort-of-cancer-patients-with-no-reported-cases-of-sars-cov-2-infection-the-possible-preventive-role-of-methylene-blue/

We report the case of a cohort of 2500 French patients treated among others with methylene blue for cancer care. During the COVID-19 epidemics none of them developed influenza-like illness. Albeit this lack of infection might be by chance alone, it is possible that methylene blue might have a preventive effect for COVID-19 infection. This is in line with the antiviral activity of Chloroquine, a Methylene blue derivative.

Both Chloroquine and Methylene blue have strong antiviral and anti- inflammatory properties probably linked to the change in intracellular pH and redox state.

Warning: this gets really science-y, down to the molecular level trying to explain the mechanism.

I'm not sure that this cohort he describes is representative of what would be typical exposure to the virus. Another consideration is that the report is as of March 27. How far into the pandemic was France back then?