SFN and COVID-19: Even if EMG was used prevalently for SFN diagnosis exclusion and changes of MUAP morphology and shape were described in SFN+ cases only sporadically [19,21], in most of our PC- and PCV-associated SFN+ patients we observed MUAP abnormalities that were clearly different from SFN− patients showing short duration, small amplitude, and polyphasic aspect, without spontaneous activity of positive sharp waves and fibrillations, as previously demonstrated frequently in post-COVID-19 cases [39].