COVID-19

Coronavirus disease 2019 (COVID-19) is a contagious disease caused by the coronavirus SARS-CoV-2. Starting in January 2020, the disease spread worldwide, resulting in the COVID-19 pandemic. In March 2020, the World Health Organization declared COVID-19 a global health emergency; they declared the end of the emergency in May 2023.

Wikimedia portal

theoretical future stage of COVID-19

Twindemic and tripledemic (or tridemic) were terms used during the COVID-19 pandemic, referring to the possibility of a severe flu season happening alongside an increase in cases of COVID-19 during the fall and winter of 2020 and 2021, as well as respiratory syncytial virus in the winter of 2022. A consequence of a twindemic may be a mixture of two different infections in the same person at the same time. The term twindemic is a portmanteau of "twin" and "pandemic". __TOC__

medical science

species of caddisfly