Yes. I had it on day two of being tested positive. I am a 76 year old female and in fairly good health. It felt like I had a head cold and was very tired for about three days. I think the antibody infusion helped me a lot. I was tired for a while after that, and lost my sense of taste for a month, but otherwise Covid was not bad for me. I had my vaccinations in Feb and became infected in Sept. I highly recommend the infusion.