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A dog from the southern United States has fever, marked muscle pain, a stiff gait, neutrophilia, muscle wasting, and periosteal proliferation. Repeated peripheral blood smears are unrewarding. Which transmission-and-sample plan best fits the leading diagnosis?

A dog with abdominal effusion has numerous solid-bodied larval cestodes in the peritoneal cavity. The larvae have deeply invaginated scolices and can multiply asexually. Which diagnosis best explains why larval disease is more serious than the adult intestinal infection?

A laboratory is tracing a digenetic fluke whose ciliated stage hatches from an operculated egg and penetrates a snail. Which sequence correctly describes development inside the snail before the next motile stage emerges?

A dog has a painful draining skin lesion on a distal limb, and a slender worm is visible within the tract. Dracunculus insignis is suspected. Which diagnostic collection method follows the parasite’s life cycle?

A dog with access to dung beetles develops abdominal pain and septic peritonitis. Surgery reveals an unsegmented worm attached deeply to the small-intestinal wall by backward-facing hooks. Which life-cycle and pathogenesis statement is most accurate?

A technician sees rare 4–6 micrometer round structures in a fecal sample from a diarrheic kitten and suspects Cryptosporidium. Which diagnostic plan is most appropriate?

An outdoor cat from an endemic area presents with acute fever, icterus, dyspnea, splenomegaly, and rapid deterioration. Cytauxzoon felis is suspected on the blood smear. Which plan should be prioritized?

Imaging of an intermediate host reveals one dominant, thick-walled, expansile hepatic hydatid cyst containing internal membranes and daughter structures. Which parasite-stage pairing is most consistent with this pattern?

The image shows an elongated, curved, flagellated organism with an undulating membrane located extracellularly among erythrocytes in a dog with fever and a ventricular arrhythmia. Which interpretation is most accurate?

Very fresh diarrheic feces from a dog with severe colitis contain motile amoeboid trophozoites with ingested erythrocytes. Which interpretation and next action are most appropriate?