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Serological Cross-Reactively Studies. C6/36 cells were inoculated with CORV or PLV at an MOI of 1, or mock-infected and fixed with 4% formaldehyde containing 0.1% triton X-100 after 4 days. IFA was performed by probing with rabbit sera raised against CORV CSIRO109l or naïve rabbit serum (negative) to assess cross-reactivity with PLV. Images were taken using ×40 magnification.
