ABSTRACT
Introduction: In Portugal, COVID-19 laboratory notifications, clinical notifications (CNs), and epidemiological investigation questionnaires (EI) were electronically submitted by laboratories, clinicians, and public health professionals, respectively, to the Portuguese National Epidemiological Surveillance System (SINAVE), as mandated by law. We described CN and EI completeness in SINAVE to inform pandemic surveillance efforts. Methods: We calculated the proportion of COVID-19 laboratory-notified cases without CN nor EI, and without EI by region and age group, in each month, from March 2020 to July 2021. We tested the correlation between those proportions and monthly case counts in two epidemic periods and used Poisson regression to identify factors associated with the outcomes. Results: The analysis included 909,720 laboratory-notified cases. After October 2020, an increase in the number of COVID-19 cases was associated with a decrease in the submissions of CN and EI. By July 2021, 68.57% of cases had no associated CN nor EI, and 96.26% had no EI. Until January 2021, there was a positive correlation between monthly case counts and the monthly proportion of cases without CN nor EI and without EI, but not afterward. Cases aged 75 years or older had a lower proportion without CN nor EI (aRR: 0.842 CI95% 0.839-0.845). When compared to the Norte region, cases from Alentejo, Algarve, and Madeira had a lower probability of having no EI (aRR;0.659 CI 95%0.654-0.664; aRR 0.705 CI 95% 0.7-0.711; and aRR 0.363 CI 95% 0.354-0.373, respectively). Discussion: After January 2021, CN and EI were submitted in a small proportion of laboratory-confirmed cases, varying by age and region. Facing the large number of COVID-19 cases, public health services may have adopted other registry strategies including new surveillance and management tools to respond to operational needs. This may have contributed to the abandonment of official CN and EI submission. Useful knowledge on the context of infection, symptom profile, and other knowledge gaps was no longer adequately supported by SINAVE. Regular evaluation of pandemic surveillance systems' completeness is necessary to inform surveillance improvements and procedures considering dynamic objectives, usefulness, acceptability, and simplicity.
Subject(s)
COVID-19 , Humans , COVID-19/epidemiology , Portugal/epidemiology , Laboratories , Pandemics , RegistriesABSTRACT
INTRODUCTION: among others, the objectives of Ghana's COVID-19 surveillance system are to rapidly detect, test, isolate and manage cases, to monitor trends in COVID-19 deaths and to guide the implementation and adjustment of targeted control measures. We therefore aimed to examine the operations of the COVID-19 surveillance system in New Juaben South Municipality, describe its attributes and explore whether its objectives were being met. METHODS: we utilized a mixed method descriptive study design to evaluate the COVID-19 surveillance system in the New Juaben South Municipality of the Eastern Region of Ghana. Desk review and key informant interviews were carried out from 1st February to 31st March 2021 to measure nine surveillance system attributes as an approximation of its performance using the CDC's 2013 updated surveillance system guidelines. RESULTS: while the COVID-19 surveillance system in New Juaben South (NJS) was highly representative of its population, it was rated 'moderate' for its stability, flexibility, sensitivity and acceptability. The system was however characterized by a low performance on data quality, simplicity, timeliness and predictive value positive. The sensitivity and predictive value positive (PVP) of the system were 55.6% and 31.3% respectfully. CONCLUSION: while the surveillance system is only partially meeting its objectives, it is useful in the COVID-19 response in New Juaben South Municipality. System performance could improve with stigma reduction especially among health care workers, timely testing and simplification of surveillance forms and software.