In the public health context, an emerging risk is a hazard or potential hazard that has not been detected or understood well enough to assess the possible risks and consequences.
There are several factors that make COVID 19 an emerging risk. First, the virus has not been well studied and scientists do not yet understand all of its properties. Second, the pandemic is still in its early stages and there is a lot of uncertainty about how it will spread and what effects it will have. Finally, there are no specific treatments or vaccines for COVID 19 so it is difficult to protect people from getting infected.
All of these factors make COVID 19 a cause for concern and underscore the importance of doing more research to better understand the virus.