To clarify the precise relationship between previous C. pneumonia infection and EHT, we investigated the epidemiological markers concerned with EHT and measured serum immunoglobulin G (IgG) antibody to C. pneumonia.

• 为了解Cpn感染与EHT之间的关系，我们调查了与EHT有关的流行病学指标并测定了Cpn抗体来进一步研究二者之间的关联。