On April 4, the WHO issued a global advisory warning travelers to avoid Hong Kong and China's Guangdong Province unless absolutely necessary. This was the first time in many years that the WHO had declared a specific territory off-limits.
四月二日，WHO 更進一步呼籲各國旅客，除非必要，不要前往香港及廣東，這是 WHO 多年來第一次因傳染病而發佈特定地區的「禁足令」。