Nawa Y
Department of Parasitology, Miyazaki Medical College, Japan.
Southeast Asian J Trop Med Public Health. 1991 Dec;22 Suppl:342-4.
Miyazaki Prefecture has long been known as one of the endemic areas of paragonimiasis westermani. The prevalence of this disease peaked around 1956 and then drastically decreased. A few sporadic cases are still occasionally found in Miyazaki Prefecture; however, the number of new cases has gradually increased during the last 5 years. One important point to be noted is the change of clinical manifestations in the patients. A classically known form of paragonimiasis westermani is characterized by persisting cough, bloody sputum, and nodular or ring shadows in the lung field by chest x-ray. However, the patients recently found in Miyazaki Prefecture rarely showed such typical symptoms. Only four of 13 cases were found to have pulmonary infiltration and nine cases showed massive pleural effusion without pulmonary infiltration. Such atypical cases may be caused by low intensity of infection or, alternatively, be due to the earlier diagnosis.
宫崎县长期以来一直被认为是卫氏并殖吸虫病的流行地区之一。这种疾病的患病率在1956年左右达到峰值，随后急剧下降。在宫崎县仍偶尔发现一些散发病例；然而，在过去5年中，新病例的数量逐渐增加。需要注意的一个重要点是患者临床表现的变化。卫氏并殖吸虫病的经典表现为持续咳嗽、咯血痰，胸部X线显示肺野有结节状或环状阴影。然而，最近在宫崎县发现的患者很少表现出这种典型症状。13例患者中只有4例有肺部浸润，9例有大量胸腔积液但无肺部浸润。这些非典型病例可能是由于感染强度低，或者是由于早期诊断。
