241 of 562 patients (42.9%) were on anti-TNF-a, 179 (31.9%) on anti-IL-17, 114 (20.3%) on anti-IL-12/23, and 28 (5%) were on anti-IL-23 agents. All patients had been vaccinated against influenza and COVID-19, depending on the availability of the latter during the particular time period. Biological therapy was not interrupted in any case of SARS-CoV-2 infection either by the dermatologist or at the patient's request.Of the 562 affected patients, 432 patients (76.9%) experienced an exacerbation of psoriasis during COVID-19 infection defined as an increase in PASI by at least 4 points. Remarkable sustained efficacy with a change in PASI of ≤ 4 was observed in patients receiving IL-17 inhibitors, with 112 patients (62.6%) maintaining their absolute PASI, which outperformed the other agents (P < 0.05). The second most durable biologic in terms of efficacy was anti-TNF-a (18 of 241), but this also had a high rate of relapsed patients (92.5%). In addition, 67 patients treated with anti-IL-17 agents experienced a relapse. All patients treated with anti-IL-12/23 or anti-IL-23 demonstrated an increase in PASI of ≥ 4 (Table 1), but this regression in psoriasis was transient and as brief as 10 days (mean AE SD 30 AE 20 days). No modification in treatment regimen nor agent switch was required due to psoriasis exacerbation.Our study suggests that biologic treatments for psoriasis, particularly anti-IL-17 agents, sustain their beneficial results in the long run even during COVID-19 infection. Given that SARS-CoV-2 seems to initiate an IL-17-enriched response, this might explain why different active principles could lead, even temporarily, to different degrees of effectiveness. 2-4 However, larger long-term studies are needed to draw definite conclusions.