BS. It is the job of the attending physician to get a complete history.
This is a busy city emergency room. The triage nurse or whatever on duty probably got the information but didn’t bother to mention it in his or her report to the medical personnel. This guy had every red flag in the universe, so you’d think that somebody would have noticed something, but I think they probably have a lot of patients to treat and they get careless.
Also, travel to Liberia is probably not that unusual in North Texas - there are some 10,000 Liberians living there.