rickettsial myocarditis

例句：

1. 1. Rickettsia is a type of bacteria that causes rickettsial myocarditis.
   莱克西氏是一种引起莱克西氏心肌炎的细菌。
2. 2. The patient was diagnosed with rickettsial myocarditis and required immediate treatment.
   患者被诊断出患有莱克西氏心肌炎，需要立即治疗。
3. 3. Rickettsia can cause severe illnesses, including rickettsial myocarditis.
   莱克西氏可以引起严重的疾病，包括莱克西氏心肌炎。