보건당국은 발병 사실을 처음 발표했을 때부터 여러 차례 "사람 간 전염 현상은 뚜렷이 발견되지 않았으며 의료진 감염도 없었다"고 강조해왔다.
"The human-to-human transmission was not clear and there was no infection by medical staff," health officials stressed several times since the incident was first known.