Vaccination status of patients with primary immunodeficiencies in Germany-a multicentric epidemiologic analysis.

Background: Vaccinations represent an easily accessible, safe, and important method for preventing infections. Patients with primary immunodeficiencies (PID) are more susceptible to infections and should receive an extended spectrum of immunizations in many countries.

Methods: Between January 2019 and May 2020, vaccination certificates of 70 patients with PID from the regions of Würzburg and Hanover in Germany were evaluated. The patients were additionally surveyed regarding their attitude towards vaccinations and the communication with their physicians. Medical records were analyzed.

Results: Of the 70 patients, 54 (77%) suffered from common variable immunodeficiency, 30 (43%) were diagnosed with accompanying autoimmunity, 62 (89%) had an increased susceptibility to infections, and 56 (80%) were on immunoglobulin substitution therapy. Seven patients (10%) had neither a vaccination certificate nor were they able to recollect of their last vaccination. Only 55 (79%) and 43 (61%) patients stated that their rheumatologist or immunologist had recommended an influenza and a pneumococcal vaccination, respectively. When asked about their overall trust in vaccinations on a scale of 0 to 10 (0 = very low, 10 = very high), the mean value was 7.8. The most common vaccination was against tetanus in 63 (90%) patients, 49 (70%) had received vaccination against pneumococci, and 39 (56%) had received an influenza vaccination. Interestingly, 26 patients (37%) were vaccinated against measles, even though this is contraindicated in most PID patients.

Conclusion: Our data suggest that vaccination rates in this at-risk population are insufficient. Healthcare providers should emphasize vaccinations routinely when caring for these patients.