SORU: paragrafta boş bırakılan yere uygun düşen cümleyi bulunuz
As yet it is too soon to know if the longterm effects of West Nile will mimic those of poliovirus. But already there are warning signs. ---- . A study tracking the first group of US meningo encephalitis patients in 1999 found that more than half still had problems with fatigue, weakness, memory loss or depression a year later.