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SARS-CoV-2 immunohistochemistry in infected placenta. (A) Strong granular staining (red chromogen) observed in the trophoblastic lining of chorionic villi (CV) in a case of SP in the third trimester. SARS-CoV-2 anti-spike mouse monoclonal antibody (mAb 1A9), dilution 1:1000; GeneTex, Irvine, CA, USA); (B) unaffected gestational-age-matched control. Original magnifications X400. Image from the author’s collection (the picture has not been previously published).
