Trump did not claim that his blood is the vaccine and tweet in the the image circulating with this claim this is fake.
This message does not appear on Trump's timeline, nor does it appear in any of the databases that catalog and archive Trump's deleted messages. Facebook flagged this post as part of its efforts to combat false news and misinformation on its news feed.
Searching more online, we found no news coverage about Trump claiming his blood was a vaccine or articles about Twitter removing such a tweet.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.