Within two months, the World Health Organization raised the pandemic alert by three levels, from Phase 3, indicating sporadic individual infections, up to Phase 6, signifying widespread international infection. It's a solemn warning of the outbreak of a global pandemic.
兩個月內，世界衛生組織發布的防疫警戒三級跳，從只有零星個體感染的第 3 級，升至持續跨國感染的第 6 級，嚴正警告全球即將爆發大流行。