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Determination of infectivity to mice. (a) Control tetrathyridium before being injected into mouse (85x). (b) Control tetrathyridium extracted from a mouse after 2 months following infection (100x). (c) Tetrathyridium exposed to thymol (250 μL/mL, overnight) before being injected into mouse. Note the loss of morphology and microtriches. The body appeared elongated and flattened (50x).
