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Frequency of pathological changes in the midgut of C. tarsalis. Cell rounding and sloughing was the only pathology found in uninfected individuals. Signs of necrosis were only found in HVP and COAV strains, consistently at 48 h after infection. COAV, Coachella Valley; CRS, cell rounding and sloughing; HVP, high viremia producer; KNWR, Kern National Wildlife Refuge; WR, WEEV resistant.
