>> robyn garfield: yes. fell down multiple times that day. >> britta garfield: we went on a walk and she just fell on her face. it was very abnormal. she never does that. and then a second time, she completely lost her balance and just fell to the side. >> pelley: in 2018, the secretary of state mike pompeo confirmed the case of catherine werner. u.penn found her brain injuries matched the cuba victims. >> mike pompeo: we had an incident in guangzhou that the medical indications are very similar and entirely consistent with the medical indications that have taken place to americans working in cuba. >> pelley: but for reasons that are unclear, the state department is raising doubt about the other 14 china cases. the state department's medical office sent mark lenzi this note, that says "we have reached the decision that your symptoms and findings do not correlate with the havana cohort." >> lenzi: they tried to deny it. they tried to cover it up. they tried to minimize it. >> pelley: why would the state depar