Nasa astronauts begin 'bittersweet' medical evacuation from space station
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www.bbc.com/news/articles/c205r8n0276o
www.bbc.com/news/articles/c205r8n0276o
Those two statements are distinctly separate, and accurate. The previous health issues that ended missions early were unrelated to the ISS.
A lot of time and effort goes into ensuring astronaut health and mitigating exposure leading up to missions.