The committee "highlighted the anticipated lengthy duration of this COVID-19 pandemic", the WHO said in a statement, and warned of the risk of "response fatigue" given the socio-economic pressures on countries.
The panel gathered on Friday for the fourth time over the coronavirus crisis, half a year on from its Jan 30 declaration of a public health emergency of international concern (PHEIC) - the WHO's highest level of alarm.
"WHO continues to assess the global risk level of COVID-19 to be very high," it said following the meeting.
And the committee wanted more light shed on the dynamics of the virus, such as "modes of transmission, shedding, potential mutations; immunity and correlates of protection".
The committee warned countries to prepare their health systems to cope with seasonal influenza and other disease outbreaks alongside the new coronavirus.