There are up to 50,000 symptomless carriers of the disease in the area.
在这个地区，有多达五万名这种疾病的无症状带菌者。
Usually early symptomless, when the symptom presents the eye to be blind, irreversible.
通常早期无症状，等到症状出现眼睛已瞎，不可逆转。
This is why congenital abnormalities in the region of the neck may be symptomless for years.
这就是先天性颈部畸形可以多年无症状得原因。
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