When the head of the World Health Organization returned from a whirlwind trip to Beijing in late January, he wanted to praise China’s leadership publicly for its initial response to the new coronavirus. Several advisers suggested he tone the message down, according to a person familiar with the discussions.

After meetings with President Xi Jinping and Chinese ministers, Tedros Adhanom Ghebreyesus was impressed by their knowledge of the new flu-like virus and their efforts to contain the disease, which by then had killed scores in China and started to spread to other countries.

The advisers encouraged Tedros to use less effusive language out of concern about how he would be perceived externally, the person familiar with the discussions said, but the director-general was adamant, in part because he wanted to ensure China’s cooperation in fighting the outbreak.