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Foreign‐born (FB) persons represent a large proportion of adults with chronic hepatitis B (CHB) in Canada due to higher prevalence rates in countries of birth for FB persons. Suboptimal awareness and low rates of hepatitis delta virus (HDV) testing contribute to underdiagnosis and gaps in accurate estimates of Canada HDV prevalence. We aim to provide an assessment of CHB and HDV prevalence in Canada using a comprehensive literature review and meta‐analysis. A comprehensive literature review of articles reporting HBsAg seroprevalence and anti‐HDV prevalence was conducted to calculate country‐specific rates and pooled prevalence of CHB and HDV using meta‐analyses. Country‐specific CHB and HDV rate estimates were combined with number of FB persons in Canada in 2021 from Statistics Canada to estimate total numbers of FB with CHB and HDV, respectively. These estimates were combined with estimates of Canada‐born persons with CHB and HDV to yield the total number of persons with CHB and HDV. In 2021, we estimated 0.550 million (M) (95% CI 0.488–0.615) persons with CHB; 0.344 M (95% CI 0.288–0.401) were FB and 0.206 M (95% CI: 0.200–0.214) were Canada‐born. The weighted average HDV prevalence among FB persons in Canada was 5.19% (17,848 [95% CI 9611–26,052] persons), among whom 50% emigrated from Asia and 31% from Africa. When combined with estimates of Canada‐born persons with HDV, we estimate 35,059 (95% CI: 18,744–52,083) persons with HDV in Canada. In conclusion, we estimate 0.550 M and 35,059 persons living with CHB and HDV, respectively, in Canada in 2021. [ABSTRACT FROM AUTHOR]

Three indicators of the perceived conflict between urban cross-country skiers and snowmobilers in Alberta show that the conflict is asymmetrical. Skiers perceive snowmobilers as interfering negatively with their activity, while snowmobilers enjoy or are indifferent to meeting skiers. (Authors/JN)

Examines fluoride exposure of workers in an aluminum smelter in British Columbia. Implications of the exposure for the musculoskeletal system, hemopoietic tissue, liver and renal function; Increase in density, calcification ligaments and periosteal changes in workers employed for ten years; Evidence of skeletal fluorosis in exposed workers.

Background & Aims: There is controversy over the effects of direct-acting antiviral (DAA) therapies for hepatitis C virus (HCV) infection on hepatocellular carcinoma (HCC) recurrence and tumor aggressiveness. We compared HCC recurrence patterns between DAA-treated and untreated HCV-infected patients who had achieved a complete response to HCC treatment in a North American cohort., Methods: We conducted a retrospective cohort study of patients with HCV-related HCC with a complete response to resection, local ablation, transarterial chemo- or radioembolization, or radiation therapy from January 2013 through December 2017 at 31 health systems throughout the United States and Canada. Cox regression was used to examine the association between DAA therapy and time to recurrence after a complete response, with DAA therapy analyzed as a time-varying exposure. We also estimated the association between DAA therapy and risk of early HCC recurrence (defined as 365 days after complete response)., Results: Of 793 patients with HCV-associated HCC, 304 (38.3%) received DAA therapy and 489 (61.7%) were untreated. HCC recurred in 128 DAA-treated patients (42.1%; early recurrence in 52 patients) and 288 untreated patients (58.9%; early recurrence in 227 patients). DAA therapy was not associated with HCC recurrence (hazard ratio 0.90, 95% confidence interval 0.70-1.16) or early HCC recurrence (hazard ratio 0.96, 95% confidence interval 0.70-1.34) after we adjusted for study site, age, sex, Child-Pugh score, α-fetoprotein level, tumor burden, and HCC treatment modality. In DAA-treated and untreated patients, most recurrences were within the Milan criteria (74.2% vs 78.8%; P = .23). A larger proportion of DAA-treated than untreated patients received potentially curative HCC therapy for recurrent HCC (32.0% vs 24.6%) and achieved a complete or partial response (45.3% vs 41.0%) but this did not achieve statistical significance., Conclusion: In a large cohort of North American patients with complete response to HCC treatment, DAA therapy was not associated with increased overall or early HCC recurrence. HCC recurrence patterns, including treatment response, were similar in DAA-treated and untreated patients., (Copyright © 2019 AGA Institute. Published by Elsevier Inc. All rights reserved.)