A Chinese medical team, mobilized to assist the Democratic Republic of Congo in its fight against the Ebola virus, prepares for departure at Beijing Capital International Airport late on Monday. ZHANG DAN / FOR CHINA DAILY

Aid groups warn the response has not kept pace with one of the fastest-spreading outbreaks on record, with 906 suspected cases and 223 suspected deaths.

On arrival in Congo's capital Kinshasa on Thursday, Tedros called for more international support for the Ebola response, saying the WHO had so far received only a third of its…