Pemphigus, Bullous Pemphigoid Risk Increased After COVID-19 Infection

TOPLINE:

COVID-19 infection increases the risk for autoimmune blistering diseases (AIBDs), specifically pemphigus and bullous pemphigoid, according to a study that also found that vaccination against COVID-19 is associated with a reduced risk for these conditions.

METHODOLOGY:

• Researchers conducted a population-based retrospective cohort study using data from the TriNetX Analytics Network, encompassing over 112 million electronic health records in the United States.
• The study compared the risk for AIBD within 3 months among individuals who had COVID-19 infection and no COVID-19 vaccination 6 months prior to the infection (n = 4,787,106), individuals who had COVID-19 vaccination but did not have COVID-19 infection (n = 3,466,536), and individuals who did not have COVID-19 infection or vaccination (n = 5,609,197).
• The mean age of the three groups was 44.9, 52.3, and 49.3 years, respectively.
• Propensity score matching included 4,408,748 individuals each for the comparison between COVID-19 infection and controls, 3,465,420 for COVID-19 vaccination and controls, and 3,362,850 for COVID-19 infection and vaccination. The mean follow-up ranged from 72.2 to 76.3 days.

TAKEAWAY:

• Individuals with COVID-19 infection showed a 50.8% increased risk for AIBD within 3 months (P < .001) compared with those without infection or vaccination. The risk was more pronounced for pemphigus (hazard ratio [HR], 2.432; P < .001) than bullous pemphigoid (HR, 1.376; P = .036).
• On the contrary, individuals who had the COVID-19 vaccination showed almost half the risk for AIBD (HR, 0.514; P < .001). The risk reduction was significant for pemphigus (HR, 0.477; P = .030), but not for bullous pemphigoid (HR, 0.846).
• When the infection and vaccination groups were compared, COVID-19 infection increased AIBD risk by more than threefold (HR, 3.130; P < .001), with a particularly high risk for pemphigus (HR, 5.508; P < .001). A significant risk was also seen for bullous pemphigoid (HR, 1.587; P = .008).

IN PRACTICE:

“The findings underscore the importance of vaccination not only in preventing severe COVID-19 outcomes but also in potentially protecting against autoimmune complications,” the authors wrote, adding that “this potential dual benefit of vaccination should be a key message in public health campaigns and clinical practice to enhance vaccine uptake and ultimately improve health outcomes.”

SOURCE:

The study was led by Philip Curman, MD, PhD, of the Dermato-Venereology Clinic at Karolinska University Hospital, Stockholm, Sweden, and was published online on November 7 in the Journal of the American Academy of Dermatology.

LIMITATIONS:

The retrospective design has inherent biases, there is potential underreporting of COVID-19 cases and vaccinations, and there is misallocation of individuals. Unmeasured confounding factors may be present.

DISCLOSURES:

This study was funded by grant from the State of Schleswig-Holstein. Two authors were employees of TriNetX. Some authors received financial support and travel grants from various sources, including TriNetX. Additional disclosures are noted in the article.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article appeared on Medscape.com.