at a university – lower than expected for all age groups, Lisa-Maria Steurer, MD, said regarding study findings reported at the annual meeting of the European Society for Paediatric Infectious Diseases, held virtually this year.
CDC/Sarah Bailey Cutchin/Illustrator Dan Higgins
Illustration of a number of diplococcal, gram-negative, Neisseria meningitidis bacteria.
“This implicates that the risk of horizontal meningococcal transmission via this health care professional cohort seems to be low,” said Dr. Steurer, of the Medical University of Vienna.
Her data were based on a survey conducted between April and October 2018 at the department of paediatrics and adolescent medicine at the tertiary university pediatric hospital. The study aimed to determine colonization rates of Neisseria meningitidis and the serogroup distribution of carried meningococcal isolates in asymptomatic health care professionals employed there, reported Dr. Steurer. Her research team also sought to identify what factors increased risk of N. meningitidis carriage.
“We who work in pediatrics and adolescent medicine are exposed to those patient cohorts with the highest risk for meningococcal carriage, but also to those patients who have the highest risk for serious, invasive meningococcal disease, which peaks at the extremities of age,” declared Dr. Steurer. “But currently, there is no surveillance of asymptomatic carriers in this health care professional cohort.”
A total of 437 oropharyngeal swabs were collected from enrolled nurses, pediatricians, and medical students working in the department and immediately plated onto selective agar plates. Conventional culture was used to identify bacteria, and meningococcal isolates were characterized further through whole-genome sequencing. Sociodemographic data and information on participants’ vaccination status were collected via questionnaire.
The main finding was an overall meningococcal prevalence of 1.14%. Among the participants, the median age was 33 years, and the highest rate of carriage, 4.4%, was observed in those aged 18-25 years. None of the carriers were older than 35 years. There was a negative association found between carriage and participants’ age and time employed in the field, Dr. Steurer said.
“Risk-factor analysis found an inverse correlation with meningococcal carriage for age and timespan working in pediatrics. On the contrary, no correlations with carriage could be found for all other factors evaluated,” she said. These factors included recent contact with an immunodeficient patient, respiratory tract infection, smoking, vaccination against any meningococcal serogroup, different professions, main work settings, month of swab collection, and living with children or adolescents in the same household.
Of the study population, 29% reported that they had been vaccinated against at least one meningococcal serogroup. “Interestingly, while more than 50% of doctors and medical students had a vaccination against at least one meningococcal serogroup, only 17% of nurses were vaccinated,” Dr. Steurer remarked.
The study was financially supported by Pfizer. Dr. Steurer had no other relevant financial disclosures.