 By February 26 , we found 33 listings offering a COVID-19 vaccine, seven of which offering officially approved vaccines  .
<meaning-changed>  By February 26 , we found 33 listings offering a COVID-19 vaccine, seven of which offering officially approved vaccines  .
 By February 26 , we found 33 listings offering a COVID-19 vaccine, seven of which offering officially approved vaccines and 25 fabricated proofs of vaccination .