The impact of vaccination status on importation of COVID-19 among international travellers.

Governments worldwide are looking for ways to safely enable international travel while mitigating the spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), and the associated coronavirus disease 2019 (COVID-19). However, few data describe the impact of vaccination on importation of COVID-19. We took advantage of the sequential introduction of two government policies in Canada to evaluate the real-world evidence of vaccine effectiveness among 30,361 international travellers arriving by air in Alberta, Canada. The proportion of COVID-19-positive results for travellers who were either fully vaccinated or partially vaccinated was 0.02% (95% CI: 0.00-0.10) (i.e. one positive case among 5,817 travellers). In contrast, 1.42% (95% CI: 1.27-1.58) of unvaccinated travellers tested positive for SARS-CoV-2 (341 cases among 24,034 travellers). These findings suggest that COVID-19 vaccinations approved in Canada, substantially reduced the risk of travel-related importation of COVID-19 when combined with other public health measures. The low absolute rate of infection among fully vaccinated or partially vaccinated international travellers may inform quarantine requirements in this population.

COVID-19 infection among international travellers: a prospective analysis.

OBJECTIVES: This report estimates the risk of COVID-19 importation and secondary transmission associated with a modified quarantine programme in Canada. DESIGN AND PARTICIPANTS: Prospective analysis of international asymptomatic travellers entering Alberta, Canada. INTERVENTIONS: All participants were required to receive a PCR COVID-19 test on arrival. If negative, participants could leave quarantine but were required to have a second test 6 or 7 days after arrival. If the arrival test was positive, participants were required to remain in quarantine for 14 days. MAIN OUTCOME MEASURES: Proportion and rate of participants testing positive for COVID-19; number of cases of secondary transmission. RESULTS: The analysis included 9535 international travellers entering Alberta by air (N=8398) or land (N=1137) that voluntarily enrolled in the Alberta Border Testing Pilot Programme (a subset of all travellers); most (83.1%) were Canadian citizens. Among the 9310 participants who received at least one test, 200 (21.5 per 1000, 95% CI 18.6 to 24.6) tested positive. Sixty-nine per cent (138/200) of positive tests were detected on arrival (14.8 per 1000 travellers, 95% CI 12.5 to 17.5). 62 cases (6.7 per 1000 travellers, 95% CI 5.1 to 8.5; 31.0% of positive cases) were identified among participants that had been released from quarantine following a negative test result on arrival. Of 192 participants who developed symptoms, 51 (26.6%) tested positive after arrival. Among participants with positive tests, four (2.0%) were hospitalised for COVID-19; none required critical care or died. Contact tracing among participants who tested positive identified 200 contacts; of 88 contacts tested, 22 were cases of secondary transmission (14 from those testing positive on arrival and 8 from those testing positive thereafter). SARS-CoV-2 B.1.1.7 lineage was not detected in any of the 200 positive cases. CONCLUSIONS: 21.5 per 1000 international travellers tested positive for COVID-19. Most (69%) tested positive on arrival and 31% tested positive during follow-up. These findings suggest the need for ongoing vigilance in travellers testing negative on arrival and highlight the value of follow-up testing and contact tracing to monitor and limit secondary transmission where possible.

Video Visits Using the Zoom for Healthcare Platform for People Receiving Maintenance Hemodialysis and Nephrologists: A Feasibility Study in Alberta, Canada.

BACKGROUND: Demand for virtual visits (an online synchronous medical appointment between a health care provider and patient) is increasing due to the COVID-19 pandemic. There may be additional benefits of virtual visits as they appear to be convenient and potentially cost-saving to patients. People receiving maintenance hemodialysis require ongoing care from their nephrologist and may benefit from virtual visits; however, the optimal model for a virtual kidney clinic is unknown. OBJECTIVE: To codesign and assess the feasibility of a virtual (video) kidney clinic model with clinic staff, nephrologists, and patients receiving maintenance hemodialysis, to be used for routine follow-up visits. DESIGN: Mixed-methods study. SETTING: Two main kidney clinics in central Calgary, Alberta. PARTICIPANTS: Adults with kidney failure receiving maintenance hemodialysis, nephrologists, and clinic staff. METHODS: First, we individually interviewed clinic staff and nephrologists to assess the needs of the clinic to deliver virtual visits. Then, we used participant observation with patients and nephrologists to codesign the virtual visit model. Finally, we used structured surveys to evaluate the patients' and nephrologists' experiences when using the virtual model. RESULTS: Eight video visits (8 patients; 6 nephrologists) were scheduled between October 2019 and February 2020 and 7 were successfully completed. Among completed visits, all participants reported high satisfaction with the service, were willing to use it again, and would recommend it to others. Three main themes were identified with respect to factors influencing visit success: IT infrastructure, administration, and process. LIMITATIONS: Patients received training on how to use the videoconference platform by the PhD student, whom also set up the technical components of the visit for the nephrologist. This may have overestimated the feasibility of virtual visits if this level of support is not available in future. Second, interviews were not audio-recorded and thematic analysis relied on field notes. CONCLUSIONS: Video visits for routine follow-up care between people receiving hemodialysis and nephrologists were acceptable to patients and nephrologists. Video visits appear to be feasible if clinics are equipped with appropriate equipment and IT infrastructure, physicians are remunerated appropriately, and patients receive training on how to use software as needed.

CONTEXTE: La demande pour des consultations virtuelles (rendez-vous médical par vidéoconférence entre un patient et son fournisseur de soins) augmente en raison de la pandémie de COVID-19. Ces consultations pourraient présenter des avantages pour les patients, notamment en raison de leur côté pratique et des économies qui en résultent. Les patients recevant des traitements d'entretien par hémodialyse nécessitent un suivi continu de la part de leur néphrologue et pourraient tirer profit de ce type de consultation. On ignore toutefois quel modèle de clinique de néphrologie virtuelle serait optimal. OBJECTIF: Concevoir, conjointement avec le personnel des cliniques, les néphrologues et les patients recevant des traitements d'hémodialyse, un modèle de consultation virtuelle (vidéoconférence) pour les visites de suivi de routine, et en évaluer la faisabilité. TYPE D'ÉTUDE: Étude à méthodes mixtes. CADRE: Les deux principales cliniques de néphrologie du centre de Calgary (Alberta). SUJETS: Des adultes atteints d'insuffisance rénale et recevant des traitements d'hémodialyse, des néphrologues et le personnel des cliniques concernées. MÉTHODOLOGIE: En premier lieu, le personnel de la clinique et les néphrologues ont été interrogés individuellement afin d'évaluer les besoins de la clinique en matière de consultations virtuelles. Les observations des participants ont ensuite servi à la conception conjointe du modèle de consultation virtuelle avec les patients et les néphrologues. Enfin, des questionnaires structurés ont servi à évaluer les expériences des patients et des néphrologues lors de l'utilisation du modèle. RÉSULTATS: Huit consultations virtuelles (8 patients; 6 néphrologues) étaient prévues entre octobre 2019 et février 2020, dont sept ont été réalisées avec succès. Tous les participants aux séances complétées se sont dits très satisfaits du modèle et ont mentionné qu'ils seraient prêts à l'utiliser à nouveau et qu'ils le recommanderaient à d'autres. Trois principaux thèmes ont été dégagés quant aux facteurs influençant le succès de la consultation ont été dégagés: l'infrastructure, l'administration et le processus informatiques. LIMITES: Les patients avaient reçu une formation sur l'utilisation de la plateforme de vidéoconférence de la part d'un étudiant au doctorat, lequel a également mis en place les composantes techniques de la consultation pour le néphrologue. La faisabilité des consultations virtuelles pourrait être surestimée si ce niveau de soutien n'est pas offert à l'avenir. Deuxièmement, les entrevues n'étaient pas enregistrées sur des fichiers audio, l'analyse thématique reposait donc sur des notes d'observation. CONCLUSION: Les patients hémodialysés et les néphrologues ont jugé acceptable ce modèle de consultations virtuelles pour les suivis de routine. Les consultations par vidéoconférence sont réalisables si les cliniques sont dotées de l'équipement et de l'infrastructure informatiques appropriés, si les médecins sont rémunérés adéquatement et si les patients reçoivent une formation sur l'utilisation du logiciel, au besoin.