In 1918, the U.S. had no coordinated pandemic plans at a federal level.

1918 年，美国在联邦层面没有协调一致的大流行病计划。

Many countries have pandemic plans in place that call for giving vaccines to the most vulnerable people first while supplies are limited.

许多国家制定了大流行计划，要求在供应有限的情况下率先向最脆弱的人群提供疫苗。