Angiostrongylus cantonensis - Adult female worm of <i>Angiostrongylus cantonensis</i> recovered from rat lungs with characteristic barber-pole appearance (anterior end of worm is to the top). Scale bar = 1 mm. © John F. Lindo, Cecilia Waugh, John Hall, Colette Cunningham-Myrie, Deanna Ashley, Mark L. Eberhard, James J. Sullivan, Henry S. Bishop, David G. Robinson, Timothy Holtz, and Ralph D. Robinson - Public domain - Wikimedia Commons