[edit; just found their donation page and they recieved considerable OpenPhil support, so not a candidate based on the OP’s criteria].
One Day Sooner seem like a candidate. I don’t know if they’ve received EA support, although at least one EA (David Manheim) works with them. I think they’ve done good work in bringing attention and legitimacy to the idea of human challenge trials in a pandemic situation, which seems plausibly like a very important thing for future pandemics. https://www.1daysooner.org/
[edit; just found their donation page and they recieved considerable OpenPhil support, so not a candidate based on the OP’s criteria].
One Day Sooner seem like a candidate. I don’t know if they’ve received EA support, although at least one EA (David Manheim) works with them. I think they’ve done good work in bringing attention and legitimacy to the idea of human challenge trials in a pandemic situation, which seems plausibly like a very important thing for future pandemics.
https://www.1daysooner.org/
1 Day Sooner was funded by Open Philanthropy: https://www.openphilanthropy.org/focus/global-catastrophic-risks/biosecurity/1daysooner-general-support
Several other people who work with them are connected to EA.