Oral Lesions with immunohistochemical evidence of Sars-CoV-2 in swab-negative Post-COVID Syndrome.

Our findings provide evidence that SARS-CoV-2 can persist, as for other organs/systems, also in the oral epithelium/mucosa after the acute phase and can be responsible for lesions, albeit by a pathogenetic mechanism that should be better defined but certainly referable as the oral mucosa counterpart of post-COVID syndrome.