Each infectious disease has had its own epidemic pattern and seasonality for decades.
However, public health mitigation measures during the coronavirus disease 2019 (COVID …

Background Older adults are at increased risk of SARS-CoV-2 Omicron infection and severe
disease, especially those in congregate living settings, despite high SARS-CoV-2 vaccine …

Although the dynamic zero-COVID policy has effectively controlled virus spread in China,
China has to face challenges in balancing social-economic burdens, vaccine protection, and …

Since 2020, COVID-19 has caused serious mortality around the world. Given the ambiguity
in establishing COVID-19 as the direct cause of death, we first investigate the effects of age …

Background The protective effectiveness provided by naturally acquired immunity against
SARS-CoV-2 reinfection remain controversial. Objective To systematically evaluate the …

Reinfection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants
due to immune escape is challenging for the global response to the pandemic. We …

Since SARS-CoV-2 was first reported in late 2019, multiple variations of the original virus
have emerged. Each variant harbors accumulations of mutations, particularly within the …

Background Accurate estimation of SARS-CoV-2 re-infection is crucial to understanding the
connection between infection burden and adverse outcomes. However, relying solely on …

Background The outcomes of older adult people acquiring SARS-CoV-2 reinfection was
unclear. This study aimed to compare the outcomes of older adult patients with COVID-19 …

Abstract Background SARS-CoV-2, which causes COVID-19, has killed more than 7 million
people worldwide. Understanding the development of postinfectious and postvaccination …