The Challenges of Pertussis Outbreaks in Healthcare Facilities: Is There A Light at the End of the Tunnel?

Isolation Precautions for Visitors to Healthcare Settings

Visitors may be involved in infection transmission within healthcare settings; however, there is currently limited published data on this subject. This chapter describes situations in which visitor-associated infection transmission occurred and highlights the potential role of visitors in the transmission of pathogenic organisms that can lead to outbreaks in healthcare settings. Infection prevention measures, including isolation precautions and visitor restriction, may be utilized and potentially adapted in order to protect patients and their visitors as well as healthcare personnel. The practical and ethical challenges regarding the use of isolation precautions among visitors to healthcare facilities are discussed.

Preventing the Spread of Pertussis in Pediatric Healthcare Settings

The surge in pertussis incidence in recent years underscores a critical need for effective plans to prevent transmission in pediatric healthcare settings. Adolescents and adults are common sources of infection for unimmunized or incompletely immunized infants and children with waning immunity. Despite documented outbreaks being limited in size, pertussis poses a threat to pediatric healthcare facilities due to the risk for widespread transmission, potentially severe complications among vulnerable patient populations, and high outbreak control-related costs. Healthcare personnel, visitors, and parents have been identified as sources of outbreaks, underscoring the importance of coordinated efforts to prevent transmission in these settings. This comprehensive review demonstrates that the risk of pertussis transmission in pediatric healthcare settings warrants heightened focus on strategies to recognize disease earlier, improve diagnostic evaluation, and facilitate effective contact tracing and post-exposure prophylaxis measures. This review suggests that healthcare personnel can play a significant role in the prevention of healthcare-associated pertussis.

Barriers to the Use of PPE to Prevent Pertussis Exposures in a Pediatric Primary Care Network

BACKGROUND

The resurgence of pertussis is contributing to mounting healthcare worker (HCW) exposures, especially within pediatric outpatient settings. Infection prevention and control (IPC) guidelines for ambulatory sites exist, but are not uniformly implemented. Our aim was to identify facilitators and barriers to the use of IPC practices to prevent pertussis transmission in ambulatory pediatric settings.

METHODS

HCWs at 18 of 25 (72%) clinics in a pediatric ambulatory network completed a theory-based questionnaire about pertussis and personal protective equipment (PPE). The questionnaire contained randomly distributed versions of two vignettes to create an experimental design assessing barriers to PPE use.

RESULTS

Three hundred forty-three of 467 (73%) HCWs completed the survey: 234 (68%) clinical and 109 (32%) nonclinical. Seventy-one percent of clinical HCWs reported wearing PPE when caring for a patient with suspected pertussis; only 27% used PPE for patients with any respiratory symptoms. Among clinical HCWs, reported PPE use when caring for patients with suspected pertussis was independently associated with attitudes toward PPE (odds ratio [OR] 5.4, 95% confidence interval [CI] 1.8, 16.6), knowledge and skills (OR 4.6, 95% CI 1.4, 15.2), and lack of perceived barriers (OR 3.2, 95% CI 1.3, 7.9). HCWs who did not perceive PPE use as a norm were less likely to report using PPE (OR 0.2, 95% CI 0.1, 0.6) or distributing masks to patients with cough (OR 0.02, 95% CI 0.00, 0.2). Reported PPE use was not influenced by perceived infection risk or mask accessibility.

CONCLUSION

Our results identified barriers to PPE use and targets for education to prevent pertussis transmission in ambulatory pediatric settings.

Impact of visitors and hospital staff on nosocomial transmission and spread to community

We develop a deterministic meta-population model to qualitatively capture some key features of disease transmission between a community and its healthcare facility. We consider the disease transmission dynamics within a healthcare facility and between the healthcare facility and its community. The focus of this study is to quantify the roles of the healthcare workers at and visitors to this healthcare facility in shaping the transmission dynamics during a disease outbreak. We stratify the total population into the general population in the community and the healthcare workers and visitors in the healthcare facility, to account for nosocomial transmission in the case when an individual in the community may be exposed to an infection due to a visit to the healthcare facility. Equilibrium stability analysis is carried out to inform long-term outcomes of disease dynamics in the coupled community-health care facility system. The basic reproduction number is calculated and its dependence on the waiting time and various disease transmission rates is analyzed. Numerical simulations are performed with pertussis as the disease in question. The results show that waiting time only affects the peak number of infections in the waiting reception area. The results also indicate that transmission rate of infective residents in the community and the transmission rate of the infective visitors at the healthcare facility have decisive impact on disease eradication/persistence of the coupled system; while other modes of transmissions are less important, affecting the peak number of infections at best.

Health care worker exposures to pertussis: missed opportunities for prevention

OBJECTIVE

Pediatric health care workers (HCWs) are at particular risk for pertussis exposure, infection, and subsequent disease transmission to susceptible patients. This cross-sectional study describes the epidemiology of occupational exposures to pertussis and identifies factors that may inform interventions to promote effective implementation of infection prevention and control (IPC) guidelines.

METHODS

We abstracted data from occupational health (OH) and IPC records for pertussis cases that resulted in an exposure investigation in a large quaternary pediatric care network, January 1, 2002 to July 18, 2011. We calculated the frequency of occupational exposures and measured associated characteristics. To assess the frequency of potential missed exposures, we reviewed electronic health record (EHR) data identifying laboratory-confirmed pertussis cases not documented in OH or IPC records.

RESULTS

A total of 1193 confirmed HCW pertussis exposures were associated with 219 index cases during the study period. Of these, 38.8% were infants <6 months old and 7 were HCWs. Most (77.5%) of exposures occurred in the emergency department or an ambulatory site; 27.0% of exposures occurred after documented initiation of IPC precautions. We identified 450 laboratory-confirmed pertussis cases through EHR review, of which 49.8% (N = 224) had no OH or IPC investigation. The majority of uninvestigated cases (77.2%) were from ambulatory sites.

CONCLUSIONS

Occupational exposures to pertussis occur frequently in pediatric health care settings despite appropriate IPC guidelines. Interventions are needed to ensure consistent implementation of IPC practices and timely identification and reporting of pertussis index cases to prevent HCW exposures and potential transmission to patients.

Use of models to identify cost-effective interventions: pertussis vaccination for pediatric health care workers

OBJECTIVE

Acellular pertussis vaccine is safe and effective in adults. An explicit recommendation for pertussis booster vaccination in pediatric health care workers is based on the importance of health care workers as a potential source of infection for patients. However, limited information is available on the economic attractiveness of this intervention. We sought to evaluate the health-economic attractiveness of a diphtheria-tetanus-acellular pertussis booster vaccination program for health care workers in a pediatric intensive care setting.

METHODS

We developed a Markov model to calculate the cost-effectiveness of vaccinating NICU health care workers in different proportions ranging from the current strategy of no pertussis booster vaccination program to a vaccination program that achieves between 25% and 95% vaccine coverage.

RESULTS

Implementation of a vaccination program that achieves 25% coverage was projected to be cost-saving compared with no vaccine program. At all coverage levels the intervention reduced costs, increased life expectancy, and was cost-effective. Projections were most sensitive to the risk of a pertussis introduction via an infected health care worker. Once the monthly risk of an introduction exceeded ∼0.3%, implementation of an immunization program with at least 25% coverage provided both greater health and greater economic benefits than having no vaccine program.

CONCLUSIONS

The implementation of a hospital-based and funded diphtheria-tetanus-acellular pertussis vaccine program administered through an occupational health program is cost-effective or cost-saving in the context of pediatric health care facilities in which many of the patients are at risk of serious morbidity and mortality should they acquire pertussis while hospitalized.

The Collaborative Pediatric Critical Care Research Network Critical Pertussis Study: collaborative research in pediatric critical care medicine

OBJECTIVE

To provide an updated overview of critical pertussis to the pediatric critical care community and describe a study of critical pertussis recently undertaken.

SETTING

The six sites, seven hospitals of the Collaborative Pediatric Critical Care Research Network, and 17 outside sites at academic medical centers with pediatric intensive care units.

RESULTS

Despite high coverage for childhood vaccination, pertussis causes substantial morbidity and mortality in US children, especially among infants. In pediatric intensive care units, Bordetella pertussis is a community-acquired pathogen associated with critical illness and death. The incidence of medical and developmental sequelae in critical pertussis survivors remains unknown, and the appropriate strategies for treatment and support remain unclear. The Collaborative Pediatric Critical Care Research Network Critical Pertussis Study has begun to evaluate critical pertussis in a prospective cohort.

CONCLUSION

Research is urgently needed to provide an evidence base that might optimize management for critical pertussis, a serious, disabling, and too often fatal illness for U.S. children and those in the developing world.

Keeping vulnerable children safe from pertussis: preventing nosocomial pertussis transmission in the neonatal intensive care unit

OBJECTIVE

To examine the impact of different acellular pertussis booster vaccination strategies on the probability of a nosocomial pertussis outbreak occurring and the distribution of outbreak sizes observed for each intervention strategy.

SETTING

Neonatal intensive care unit.

METHODS

We developed a stochastic, agent-based simulation model to examine the impact of booster vaccination strategies for pertussis on health care-related transmission.

RESULTS

Our results demonstrate that healthcare worker booster vaccination decreases the probability of secondary transmission from 49% (base case, no boosting) to 2% (if 95% of healthcare workers are boosted) and decreases final outbreak size. Boosting family caregivers did not have a clinically significant impact on nosocomial disease transmission.

CONCLUSION

The provision of booster vaccine to healthcare workers in the neonatal intensive care unit substantially reduces the risk of hospital-centered pertussis outbreaks in a manner that enhances the health of hospitalized children. A formal health economic analysis of this finding is currently under way. Policies to protect patient safety in pediatric facilities should include compliance with the United States Advisory Committee on Immunization Practices, which recommends provision of pertussis booster vaccination to healthcare workers.