Effectiveness of post-COVID-19 primary care attendance in improving survival in very old patients with multimorbidity: a territory-wide target trial emulation.

Background: Older adults with multimorbidity are at high risk of mortality following COVID-19 hospitalisation. However, the potential benefit of timely primary care follow-up on severe outcomes post-COVID-19 has not been well established.

Aim: To examine the effectiveness of attending general outpatient within 30 days after discharge from COVID-19 on 1-year survival among older adults aged ≥85 years, with multimorbidity.

Analysis of the Effectiveness of Measures on the COVID-19 Vaccination Rate in Hong Kong.

Background: The World Health Organization has set a target of at least 70% of the global population being vaccinated by the middle of 2022. There are only 17 countries that achieved a 70% vaccination rate (VR). This study aims to analyze the effectiveness of public policies to increase the COVID-19 VR.