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. 2015 Aug;21(8):1357–1365. doi: 10.3201/eid2108.140714

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Infectious virus titer profiles for West Nile virus (WNV)–infected carrion crows after inoculation with 2,000 50% tissue culture infectious doses (TCID₅₀) of WNV; each group (n = 6) was inoculated with a different strain. Infectious virus titers were determined by TCID₅₀ titration and are represented as log-transformed medians; error bars indicate range. The assay had a detection limit of 1.8 TCID₅₀/mL.