"And this virus may never go away", Ryan said.
Ryan said there was still some time before normalcy returns, adding there was "some magical thinking" that lockdowns work perfectly and that "unlocking lockdowns will go great".
Global public health officials are warning that the coronavirus could take years to be fully contained. "HIV hasn't gone away", Ryan said.
Scientists and experts around the world are racing against the clock in breakneck speed to find a cure for the coronavirus.
Tedros said some countries were already implementing measures such as ensuring people can collect bulk packs of treatment and self-testing kits.
"But I think it is important we are realistic and I don't think anyone can predict when this disease will disappear", he said while referring to SARS-CoV-2, the virus that causes COVID-19.
The United States has been ripped apart where a maximum number, 85,197 people, died.
Most countries imposed some form of lockdown to contain the spread of infection, with some of them gradually relaxing restrictions recently.
There is still so much to learn about the coronavirus, including whether those who get it become immune or resistant, and "the current number of people who've been infected is actually relatively low", Ryan said.
Ryan said for Covid-19 to be eliminated, a highly effective vaccine will have to be produced and made available to everyone across the world.
Most people in the world have not yet been exposed to COVID-19, which means the world is still in a very vulnerable spot. "This disease may settle into a long problem, or it may not be".
Since Covid-19, an infectious disease that primarily affects the lungs, was declared a pandemic on March 11, countries have implemented a raft of measures like restriction on movement, partial closure or closure of schools and businesses, quarantine in specific geographic areas, and worldwide travel restrictions. "People feel empowered to take out their frustrations on individuals who are purely trying to help".
"We've lacked the will, we've lacked the determination to invest in health systems to deliver that, we've lacked the capacity to sustain primary health care, at the front end".