加州公共卫生部门发出警告，一名未接种疫苗的麻疹患者于9月10日乘坐美铁列车抵达洛杉矶，途中经过阿拉米达、巴特、克恩、洛杉矶、萨克拉门托和圣华金等六个县，导致沿途出现麻疹暴露风险 1。
美国正经历三十多年来最大的麻疹复发，主要由疫苗犹豫驱动 1。宾夕法尼亚州成为全美最严重的疫情地区，今年已确认731例病例，分布在38个县，至少4人因麻疹相关疾病死亡 1。本周早些时候还发生过另一起公共交通传播事件，一名感染者乘坐美铁列车从密苏里州塞德利亚前往芝加哥，导致杰克逊县超过250人暴露 1。
加州助理州公共卫生官员Rita Nguyen表示："MMR疫苗是安全的，可提供对麻疹的长期保护" 1。
California's public health authorities have warned residents of potential measles exposure across at least six counties following travel by an unvaccinated infected passenger on Amtrak and long-distance bus services.1 The individual arrived in Los Angeles by Amtrak train on September 10, traveling through Alameda, Butte, Kern, Los Angeles, Sacramento, and San Joaquin counties.1
The exposure comes amid a significant resurgence of measles in the United States, marking the largest outbreak in over three decades, primarily driven by vaccine hesitancy.1 Pennsylvania currently experiences the nation's most severe measles outbreak, with 731 confirmed cases recorded this year across 38 counties and at least four deaths attributed to measles-related illness.1 Rita Nguyen, an assistant state public health official, stated that "the MMR vaccine is safe and provides long-term protection against measles."1
Earlier this week, another infected individual traveled on an Amtrak train from Sedalia, Missouri, to Chicago, resulting in exposure for more than 250 people in Jackson County.1 The Trump administration has altered how measles deaths are counted, with the CDC now relying on data from the National Center for Health Statistics.1
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