Tedros Adhanom Ghebreyesus gave a robust defense on Friday of his and the World Health Organization's (WHO) "timely" actions in declaring the new coronavirus an international health emergency at the end of January.

The Jan. 30 declaration was made in "enough time for the rest of the world to respond" because there were at that stage only 82 cases of infection and no deaths outside China, Tedros told a virtual media briefing at the WHO's Geneva headquarters.

Tedros said the WHO, which is seeking to lead the global response to the COVID-19 pandemic, had used the days before declaring the global emergency as time to visit China to learn more about the new virus.

During that visit, they also won a "ground-breaking agreement" with China to send in investigators, Tedros said.

Tedros, when asked about relations with the United States – its biggest donor which has suspended funding after criticizing WHO's handling of the pandemic, said: "We are actually in constant contact and we work together."

Confirming that the COVID-19 pandemic is clearly still a global health emergency, Tedros said he had "grave concerns about the potential impact" of the disease "as it starts to accelerate in countries with weaker health systems."

The WHO's head of emergencies, Mike Ryan, said the agency was seeing worrying increases in cases of COVID-19 in Haiti, Somalia, Sudan, South Sudan, Yemen, Syria, Afghanistan, Sierra Leone and northern Nigeria.

Ryan also said that while the WHO recognized that some countries are beginning to consider easing lockdown measures, it was important that they are "constantly on the look out for a jump in infections" and should be ready to put some measures back in place if needed.

Tedros said the WHO would "continue working with countries and partners to enable essential travel needed for pandemic response, humanitarian relief and cargo operations, and for countries to gradually resume normal passenger travel."

"As we have done clearly from the beginning, we will continue to call on countries to implement a comprehensive package of measures to find, isolate, test and treat every case, and trace every contact," he said.

Out of more than 3,270,000 confirmed cases, the death toll now exceeds 230,000 according to data compiled by the U.S.-based Johns Hopkins University.