“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Given the heterogeneous distribution of pandemic infection within the same country, we investigated the impact of COVID-19 in ASD patients' populations from three distinct regions of Italy (northern, Emilia Romagna; central, Tuscany; and southern, Calabria), characterised by different spread of the COVID-19 pandemic, prevalent in northern Italy with a marked gradient north-south. 16 Our 6-week multicentre telephone survey of 1641 unselected patients with ASD confirmed the quite benign clinical course of COVID-19 in ASD, along with the safety of baseline use of either bDMARD or tsDMARD [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] ; however, the survey revealed a significantly higher prevalence of (1) either definite COVID-19 (always confirmed by positive oral/nasopharyngeal swabs at PCR testing) or highly suspected COVID-19 (presence of fever and/or known contact with infected subject, and at least 4 out of 12 typical signs/symptoms of COVID-19) in patients with ASD compared with the Italian, or regional, general population; (2) definite COVID-19 plus highly suspected COVID-19 in connective tissue diseases (CTD)/vasculitis (703 patients) compared with the subgroup of chronic arthritis (938 patients with rheumatoid arthritis, psoriatic arthritis or ankylosing spondylitis); and (3) definite COVID-19 plus highly suspected COVID-19 in ASD patients without ongoing csDMARD. 16 Although a number of issues still remain to be better investigated, we can draw some provisional considerations based on the whole of currently available data: ► The actual prevalence of COVID-19 in patients with ASD might be underestimated, possibly due to concurrent factors, mainly the high rate of mild COVID-19 variants, the frequent clinical overl...…”