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Earliest detection by DNA PCR and TSA-ISH after oral-nasal exposure of cats to cell-free FIV-Ca
−Ctrl, negative control; GI, gastrointestinal tract; nd, PCR not done; +, PCR positive; −, PCR negative; (+), PCR+ only once; dark shading, ISH+; light shading, ISH−; no shading, ISH not done; E, esophagus; D, duodenum; J, jejunum; T, trachea.
