There are three versions of the vaccination logo – a standalone version to be used as a patch or integrated into other designs, a single snap tab small enough to fit in a 4×4 hoop, and a color-sorted 5-up snap tab version that requires a 5×7 or larger hoop. For the snap tab versions, stitch them out until the last color, then add a piece of vinyl (or Oly-Fun) on the back of the hoop before proceeding. Remember that the bobbin thread will show on this color.
As with other free embroidery patterns here, the SVG file is included in the ZIP package so you can modify it in Inkscape and produce your own variations/sizes/etc.
This is copyrighted by Silver Seams in the year noted in its URL, and licensed under Creative Commons’ CC-BY-SA. This basically means you’re free to sell items you make from it, provided you give reasonable attribution, and that if you modify it you’re required to share your changes with the world under the same license (the actual legal bits are in the link).