"Figure 4.24: Adult Ascaris lumbricoides roundworms can cause intestinal blockage. Left: Modification of work (c) South African Medical Research Council. CC BY 4.0. https://commons.wikimedia.org/wiki/File:Piece_of_intestine,_blocked_by_worms_(16424898321).jpg. Middle: modification of work by James Gathany, Centers for Disease Control and Prevention. Public Domain. Right: modification of work by Centers for Disease Control and Prevention. Public Domain. Figure 4.25: This animal hookworm, Ancylostoma caninum. Left,Right: modification of work by Centers for Disease Control and Prevention. Public Domain. Middle: modification of work by WeisSagung Public Domain. https://commons.wikimedia.org/wiki/File:Larva_Migrans_Cutanea.jpg Figure 4.26: E. vermicularis are tiny nematodes commonly called pinworms. By Erich gasboy. Public Domain. https://commons.wikimedia.org/wiki/File:Threadworm.jpg. (b) Centers for Disease Control. Public Domain. http://www.publicdomainfiles.com/show_file.php?id=13539970213828 Figure 4.27: (a) This adult female Trichuris whipworm is a soil-transmitted parasite. Modification of work by Centers for Disease Control and Prevention. Public domain. Figure 4.28: This image shows larvae of T. spiralis within muscle. modification of works by Centers for Disease Control and Prevention. Public Domain. Image a: https://commons.wikimedia.org/wiki/File:Trichinella_larvaeD.jpg Image b: https://commons.wikimedia.org/wiki/File:Trichinella_HBb.jpg Figure 4.29: (a) An adult tapeworm uses the scolex to attach to the intestinal wall. Modification of work by Centers for Disease Control and Prevention. Public domain. Figure 4.30: Life cycle of a tapeworm. Illustration: Modification of work by Centers for Disease Control and Prevention. CC BY 4.0. Step 1, 2, 4, 5, 6 Images: Public Domain. Step 3 Images: (c) American Society of Microbiology. Redistribution authorized with attribution. Figure 4.31: A liver fluke infects the bile ducts. Left: Figure 2 in Shafiei R, Sarkari B, Sadjjadi SM, Mowlavi GR, and Moshfe A. (2014) “Molecular and Morphological Characterization of Fasciola spp. Isolated from Different Host Species in a Newly Emerging Focus of Human Fascioliasis in Iran” Veterinary Medicine International. https://doi.org/10.1155/2014/405740. CC BY 3.0. Right: Centers for Disease Control and Prevention – Georgia Division of Public Health. Public Domain. https://commons.wikimedia.org/wiki/File:Fasciolopsis_buski_adult_GA.jpg Figure 4.32: The life cycle of Schistosoma spp. includes several species of water snails, which serve as secondary hosts. Illustration (c) Rice University. OpenStax Microbiology. CC BY"