re: Would you get the Regeneron antibody infusion if you had Covid?

That wouldn’t be effective unless the person was in a high exposure risk position.

The monoclonal simply gives you a temporary supply of antibodies. They’ve almost completely degraded within 30 days of infusion. Unless you’re getting monthly infusions it won’t work. Additionally monthly exposure is more likely to lead to side effects such as allergic reactions to anaphylaxis.

The best use is in people 3-5 days after getting exposed. This gives them immunity through the high virus replication period while also allowing their own immune system a chance to see the virus and start an active immune response for long term protection.

Beyond 10-14 days post infection, the use is limited to completely ineffective because the virus replication is mostly complete, the damage from the virus is done and now one has to deal with other factors such as preexisting condition complications or consequences from the virus like bacterial pneumonia Etc.