A single O. volvulus worm larva breaking free from an infected patient’s skin.THOMAS B. NUTMAN, LABORATORY OF PARASITIC DISEASES, NIAID, NIH

(See T.P. Johnson et al, “Nodding syndrome may be an autoimmune reaction to the parasitic worm Onchocerca volvulus,” Science, doi:10.1126/scitranslmed.aaf6953, 2017.)

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