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San Francisco train commuters may have been exposed to measles

BMJ 2015; 350 doi: https://doi.org/10.1136/bmj.h865 (Published 16 February 2015) Cite this as: BMJ 2015;350:h865
  1. Michael McCarthy
  1. 1Seattle

Health officials in the San Francisco area have warned commuters that a man with measles traveled on the Bay Area Rapid Transit (BART) system for three days while infectious, potentially exposing thousands of people to the virus.

The commuter traveled on the train during morning and evening rush hours Wednesday, Thursday, and Friday 4-6 February. The commuter was aboard the train for about a half hour on each trip. The commuter, whose identity, age, and sex health officials did not disclose, also spent several hours in a downtown restaurant and bar while contagious.

“Because the measles virus can stay in the air for up to two hours, and BART cars circulate throughout …

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