Pneumococcal vaccination coverage in individuals (16-59 years) with a newly diagnosed risk condition in Germany

Outbreak of severe community-acquired bacterial infections among children in North Rhine-Westphalia (Germany), October to December 2022

PURPOSE

In late 2022, a surge of severe S. pyogenes infections was reported in several European countries. This study assessed hospitalizations and disease severity of community-acquired bacterial infections with S. pyogenes, S. pneumoniae, N. meningitidis, and H. influenzae among children in North Rhine-Westphalia (NRW), Germany, during the last quarter of 2022 compared to long-term incidences.

METHODS

Hospital cases due to bacterial infections between October and December 2022 were collected in a multicenter study (MC) from 59/62 (95%) children's hospitals in NRW and combined with surveillance data (2016-2023) from the national reference laboratories for streptococci, N. meningitidis, and H. influenzae. Overall and pathogen-specific incidence rates (IR) from January 2016 to March 2023 were estimated via capture-recapture analyses. Expected annual deaths from the studied pathogens were calculated from national death cause statistics.

RESULTS

In the MC study, 153 cases with high overall disease severity were reported with pneumonia being most common (59%, n = 91). IRs of bacterial infections declined at the beginning of the COVID-19 pandemic and massively surged to unprecedented levels in late 2022 and early 2023 (overall hospitalizations 3.5-fold), with S. pyogenes and S. pneumoniae as main drivers (18-fold and threefold). Observed deaths during the study period exceeded the expected number for the entire year in NRW by far (7 vs. 0.9).

DISCUSSION

The unprecedented peak of bacterial infections and deaths in late 2022 and early 2023 was caused mainly by S. pyogenes and S. pneumoniae. Improved precautionary measures are needed to attenuate future outbreaks.

[Pneumococcal Vaccination Coverage Rates (VCRs) Among Persons with Vaccine-Relevant Underlying Conditions and Persons Aged 60 Years and Older - An Analysis of Secondary Data from the Statutory Health Insurance (SHI) System]

BACKGROUND

In addition to standard vaccination for patients aged 60 and older, the Standing Committee on Vaccination (STIKO) recommends immunization against pneumococci for anyone at increased risk, including patients with chronic vaccine-relevant underlying conditions. In Germany, the Robert Koch Institute (RKI) regularly publishes vaccination coverage rates (VCRs) for these patient groups, without stratifying by other parameters. This study examines VCRs of patients with underlying chronic diseases, stratified by disease groups and entities, the re-vaccination rate, and VCRs in patients aged 60 years and older.

METHODS

This descriptive retrospective cohort study is based on a sample of about 4 million SHI-insured patients aged 16 years and older for the years 2014 to 2019, from the Institute for Applied Health Research (InGef) database. The sample is representative of age and sex distribution in the German population.

RESULTS

Extrapolated to the total SHI-population, the overall pneumococcal VCR in patients aged 60 years and older was 45.9 % (of n= InGef standard vaccination cohort: 1 009 763). Among all at-risk patients aged 16 years and older with chronic underlying diseases, only 17.1 % had received an indicated vaccination (InGef indicated vaccination cohort: 1 379 680). Stratified by disease entity, those with underlying pulmonary emphysema had the highest VCR, at 39.0 % (of n= 28 121). Of those who received a vaccination due to an underlying chronic disease, only 23.9 % were re-vaccinated after 6 years (InGef re-vaccination cohort: 12 328). Across all vaccination cohorts, VCRs increased with age.

DISCUSSION

The recommendations made by STIKO for pneumococcal vaccination based on age or an underlying chronic condition are not being implemented adequately in Germany. Although STIKO explicitly recommends vaccination from 60 years of age, the 60 to 64-year-old age group had a strikingly low VCR (13.0 % of n=268 862). Fewer than one in five patients aged 16 years and older with an underlying chronic condition had received the recommended indicated vaccination. To adequately prevent potential disease, higher vaccination rates should be targeted. This could probably be achieved through more stringent vaccination management, appropriate software solutions with vaccination reminders, monetary incentives for achieving higher vaccination rates and documentation of vaccination status in disease management programs.