Seroprevalence of Bordetella pertussis in pediatric healthcare workers at the Hospital Infantil de México Federico Gómez.

Background: Bordetella pertussis is the causative agent of pertussis, a disease that is preventable by vaccination but has a high mortality, particularly in children < 6 months. Reports of pertussis outbreaks in hospitals show that the index case is usually an adult. In adults, the disease manifests mainly with persistent cough. The purpose of this study was to determine the seroprevalence of B. pertussis in the health personnel of a pediatric hospital in a country where vaccination of this staff is not considered mandatory. Methods: Nursing staff and resident doctors who were involved in direct treatment with hospitalized patients participated in the study. Each participant was screened for immunoglobulin G anti-pertussis toxin antibodies (anti-PT), and a questionnaire was applied for clinical and demographic data. Results: Ninety-three individuals were included, of which 85% were nurses, median age 35 years (interquartile range: 29-42.5). The participants worked in the emergency department (21.5%), in the Pediatric Intensive Care Unit (8.6%), and in the Neonatal Intensive Care Unit (6.5%). Detectable titers of anti-TP antibodies were found in 18.3%, of which 53% presented titles suggestive of recent infection and only 23.5% cough > 2 weeks of duration. Conclusions: Health personnel are at risk of suffering from the disease and be potential transmitters to infants, who may die from this cause. This study suggests that the current vaccination policies in health personnel should be modified to determine the compulsory nature of the vaccination, especially in those individuals in charge of the care of the pediatric population.