A 3D image of a group of Gram-positive, Streptococcus pneumoniae bacteria. Original image sourced from US Government… https://www.rawpixel.com/image/2288323/free-photo-image-bacteria-science-biologyFree Image from public domain licenseA 3D image of a group of Gram–positive, Corynebacterium diphtheriae, bacteria. Original image sourced from US… https://www.rawpixel.com/image/2288345/free-photo-image-bacteria-biology-microscopeFree Image from public domain license