In the earliest stage of infection, symptoms are non-specific and may be easily confused with more common diseases, including malaria, yellow fever, and typhoid fever.
在感染的最初阶段，症状为非特异性并可容易地与包括疟疾、黄热病和伤寒在内的较常见疾病相混淆。
2
During the second stage of the disease, the fever continues and worsens if it is not treated.
在第二阶段的疾病，发烧持续恶化，如果不接受治疗。
3
An anxious night ensued. When morning came, Mrs. Maylie's predictions were but too well verified. Rose was in the first stage of a high and dangerous fever.