Health experts are worried that a new, more virulent strain may be to blame.
卫生专家担心这一现象归咎于一种毒力更强的新菌种。
Finally FCT10.10 was selected as the highest virulent strain for production.
最终筛选出FCT10.10为诱变筛选出的高毒力菌株，可作为生产菌株。
Fortunately, the strain was far less virulent than originally feared, killing about 19,000 people.
幸运的是，这种菌株的毒性远远小于人们原先所担心的，但也造成了约19,000人死亡。
Several workers from the farm have fallen ill with the virulent new E. coli strain.
几个农场的员工也由于剧毒大肠杆菌而染病。
Several workers from the farm have fallen ill with the virulent new E. coli strain.
几个农场的员工也由于剧毒大肠杆菌而染病。
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