跟进：全美麻疹病例升至4,852例：一周新增264例、已超2025年全年两倍，43起疫情占九成六病例

美国疾病控制与预防中心（CDC）10月30日更新全国麻疹数据：截至10月29日中午，各辖区向 CDC 通报的2026年确认麻疹病例累计达4,852例，较上一次更新的4,588例一周增加264例，也已超过2025年全年2,289例的两倍。

按来源分，4,852例中有4,834例由47个辖区报告，另有18例为到访美国的国际访客。CDC 统计，2026年以来全美共报告43起新疫情（以3例以上关联病例为一起），96%的确认病例（4,666例）与疫情相关，其中3,282例来自2026年开始的疫情、1,384例来自2025年开始的疫情。

死亡方面，CDC 目前确认2026年有3例麻疹相关死亡，并注明该数字可能随复核更新。作为对照，2025年全年共报告2,289例确认病例、48起疫情，90%的病例与疫情相关。

疫苗覆盖率仍在下滑：CDC 数据显示，幼儿园儿童的麻疹、腮腺炎与风疹（MMR）疫苗覆盖率已从2019-2020学年的95.2%降至2025-2026学年的92.4%，约28万名幼儿园儿童在2025-2026学年处于风险之中。美国曾在2000年宣布消除麻疹，CDC 表示两剂 MMR 疫苗预防麻疹的有效率约为97%。

CDC 说明，本页数据只计各辖区正式通报的确认病例，不含可能病例（probable cases），且各州掌握的本地数据更新更及时；2025至2026年的病例数字为初步数据、仍可能修订。

关联：跟进：全美麻疹病例升至4,588例：一周新增178例、住院升至479人

Follow-up: U.S. Measles Cases Rise to 4,852, Up 264 in a Week and More Than Double the 2025 Full-Year Total, With 43 Outbreaks Reported

The U.S. Centers for Disease Control and Prevention (CDC) updated its national measles data on October 30: as of noon on October 29, jurisdictions had reported a cumulative 4,852 confirmed measles cases in the United States in 2026, up 264 from the previous update of 4,588 a week earlier and already more than double the 2,289 cases reported in all of 2025.

Of the 4,852 cases, 4,834 were reported by 47 jurisdictions and 18 were among international visitors to the United States. The CDC counts 43 new outbreaks reported in 2026, with an outbreak defined as three or more related cases, and says 96 percent of confirmed cases (4,666 of 4,852) are outbreak-associated: 3,282 from outbreaks that started in 2026 and 1,384 from outbreaks that started in 2025.

The CDC currently confirms three measles deaths in 2026, a number it says is subject to change as reviews are completed. By comparison, 2025 saw 2,289 confirmed cases and 48 outbreaks, with 90 percent of cases outbreak-associated.

Vaccine coverage continues to slip. CDC data show MMR (measles, mumps and rubella) coverage among kindergartners fell from 95.2 percent in the 2019-2020 school year to 92.4 percent in 2025-2026, leaving approximately 280,000 kindergartners at risk during the 2025-2026 school year. Measles was declared eliminated in the United States in 2000, and the CDC says two doses of MMR vaccine are about 97 percent effective at preventing measles.

The CDC notes that its page counts only confirmed cases notified by jurisdictions, not probable cases, that states hold the most up-to-date local information, and that 2025-2026 case counts are preliminary and subject to change.

Related: Follow-up: U.S. Measles Cases Rise to 4,588, Up 178 in a Week, Hospitalizations Reach 479

来源：GSM·美国（原文链接）

图片来源：图：美国疾病控制与预防中心（CDC）总部大楼（GSM联邦固定图库）。 / Image: Headquarters of the U.S. Centers for Disease Control and Prevention (CDC) (GSM federal fixed-image library).

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