Geneva, August 4 (RHC)-- The World Health Organization has warned that despite hopes for a vaccine, there may never be a "silver bullet" for coronavirus, and the road to normality will be long.

WHO Director-General Tedros Adhanom Ghebreyesus and WHO emergencies head Mike Ryan exhorted all nations to rigorously enforce all health measures, Tedros telling a virtual news briefing that face masks should become a symbol of solidarity around the world.

"A number of vaccines are now in phase three clinical trials, and we all hope to have a number of effective vaccines that can help prevent people from infection.  However, there's no silver bullet at the moment - and there might never be."