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A field epidemiologist performing a mouth swab inside the beak of a white duck, in order to carry out an infectious disease…
https://www.rawpixel.com/image/2288332/free-photo-image-animal-testing-swab-mouth
Free Image from public domain license
Prithpal Singh. Photograph by L.J. Bruce-Chwatt.
https://www.rawpixel.com/image/14009076/prithpal-singh-photograph-lj-bruce-chwatt
Free Image from public domain license