Seroconversion after anti‐SARS‐CoV‐2 mRNA vaccinations among moderate‐to‐severe psoriatic patients receiving systemic biologicals—Prospective observational cohort study

It is unclear whether biological antipsoriatic therapies affect seroconversion after messenger ribonucleic acid (mRNA)‐based antisevere acute respiratory syndrome coronavirus 2 (anti‐SARS‐CoV‐2) vaccinations. To assess antibody formation and the incidence of side effects after anti‐SARS‐CoV‐2 mRNA vaccinations in psoriatic patients receiving different biologicals compared to healthy controls. 102 moderate‐to‐severe psoriatic patients (56.2 [±13.5] years) and 55 age‐matched healthy (56.4 ± 13.6 years) volunteers were included in our study. Ten to 21 days after the administration of the second dosage of BNT162b2 or mRNA‐1273 vaccine, antibody levels specific to the SARS‐CoV‐2 spike (S) protein receptor binding domain were monitored. The incidence of postvaccination side effects was recorded and compared to real‐life data in the literature. Of the 102 patients, 57 (55.88%) received tumor necrosis factor (TNF), 28 (27.45%) received interleukin (IL)‐12/23, 16 (15.68%) received IL‐17, and 1 (0.99%) received IL‐23 inhibitors. No significant differences in the median serum level of anti‐SARS‐CoV‐2S antibody were observed between the study population and the control group (median IQR range: 1681.0 U/mL (600.0–4844.0) versus 1984.0 U/mL (1000.0–3136.0; p = 0.82). The most frequent side effects of the mRNA vaccines within 7 days after the administration of both dosages were arm pain on the side of injection (23.53% and 23.53%), fatigue (9.80% and 13.72%), headache (4.9% and 5.88%), and chills or shivering (4.9% and 8.82%). Detectable antibodies against SARS‐CoV‐2S protein appear 10–21 days after the administration of the second dosage of BNT162b2 or mRNA‐1273 vaccines in moderate‐to‐severe psoriatic patients receiving biologicals, similar to those of healthy controls.