根据美国疾病控制与预防中心（CDC）周五的更新，美国已报告超过4,400例麻疹病例。
Most cases have been reported among those unvaccinated or with unknown status. More than 4,400 measles cases have been reported in the U.S., according to an update on Friday from the Centers for Disease Control and Prevention (CDC).
确诊病例总计4,410例，其中大多数由45个州和华盛顿特区报告。根据CDC的数据，今年报告的病例中有18例是来美国的国际访客。
A total of 4,410 cases have been confirmed, with most reported by 45 states and Washington, D.C. Eighteen of this year's total have been among international visitors to the U.S., according to the CDC.
仅宾夕法尼亚州就由当地卫生官员报告了至少1,200例病例，同时还有六例与麻疹相关的死亡。
At least 1,200 of those cases have been reported in Pennsylvania alone by local health officials, as have six measles-related deaths.
此举正值CDC计划派遣一名“疾病侦探”前往宾夕法尼亚州应对疫情爆发之际。
It comes as the CDC is planning to send a "disease detective" to Pennsylvania in response to the outbreak.
“宾夕法尼亚州已通过Epi-Aid项目正式请求CDC协助。作为回应，CDC将支持该州确定的需求，并加强其在地面的应对工作，”CDC发言人在一份声明中对ABC新闻表示。
"Pennsylvania has formally requested CDC assistance through the Epi-Aid program. In response, CDC will support the state's identified needs and strengthen its response efforts on the ground," a CDC spokesperson told ABC News in a statement.
CDC的Epi-Aid是联邦卫生机构针对“紧急公共卫生问题”开展的快速短期野外调查。根据CDC的说明，Epi-Aid提供的资源包括但不限于增加可用于快速响应的人力以及建设流行病学能力。
A CDC Epi-Aid is a rapid, short-term field investigation from the federal health agency of an "urgent public health problem." The Epi-Aid provides resources such as, but not limited to, increasing the workforce available for rapid response and building epidemiologic capacity, according to the CDC.
声明继续表示：“CDC将继续与宾夕法尼亚州卫生官员密切合作，提供应对疫情、保护公共卫生所需的专业知识和支持。”
"CDC will continue working closely with Pennsylvania health officials to provide the expertise and support needed to respond to the outbreak and protect public health," the statement continued.
根据宾夕法尼亚州卫生部门的数据，该州病例中不到1%是已完全接种麻疹、腮腺炎和风疹（MMR）疫苗的人群。
Fewer than 1% of the state's cases are among those who are fully vaccinated with the MMR vaccine, according to the Pennsylvania Department of Health.
这与全国趋势一致。CDC在其更新中表示，根据机构数据，约96%的病例发生在未接种疫苗或疫苗接种状态不明的人群中。
This tracks with national trends. The CDC shared in it its update that about 96% of cases are among people who are unvaccinated or whose vaccination status is unknown, according to agency data.
与此同时，根据CDC的数据，2%的病例发生在仅接种了一剂MMR疫苗的人群中，另外2%的病例发生在接种了推荐两剂MMR疫苗的人群中。
Meanwhile, 2% of cases are among those who have received just one dose of the measles, mumps, rubella (MMR) vaccine and 2% of cases are among those who received the recommended two doses, according to the CDC.
疾控中心目前建议人们接种两剂麻疹、腮腺炎和风疹（MMR）疫苗，第一剂在12至15个月大时接种，第二剂在4至6岁之间接种。一剂疫苗对麻疹的有效率为93%，两剂疫苗的有效率为97%，疾控中心如是说。
The CDC currently recommends that people receive two doses of the MMR vaccine, the first at ages 12 to 15 months and the second between 4 and 6 years old. One dose is 93% effective, and two doses are 97% effective against measles, the CDC says.
然而，疾控中心的数据显示，近年来疫苗接种率一直滞后。根据数据，在2025-26学年，92.4%的幼儿园儿童接种了MMR疫苗。这一比例低于2019-20学年的95.2%，而当时尚未爆发新冠肺炎疫情。
However, CDC data shows vaccination rates have been lagging in recent years. During the 2025-26 school year, 92.4% of kindergartners received the MMR vaccine, according to data. This is lower than the 95.2% seen in the 2019-20 school year, prior to the COVID-19 pandemic.
疾控中心表示，卫生部长罗伯特·F·肯尼迪 Jr.和疾控中心主任埃里卡·施瓦茨博士“继续推荐MMR疫苗作为预防麻疹和防止感染最有效的方式。”
The CDC said that Health Secretary Robert F. Kennedy Jr. and CDC Director Dr. Erica Schwartz "continue to recommend the MMR vaccine as the most effective way to prevent measles and protect against infection."