GENEVA—The head of the World Health Organisation said on Thursday that investigations into the origins of the COVID-19 pandemic in China were being hampered by the lack of raw data on the first days of spread there and urged it to be more transparent.
A WHO-led team spent four weeks in and around the central city of Wuhan with Chinese researchers and said in a joint report in March that the virus had probably been transmitted from bats to humans through another animal.
