Cholera is an extremely virulent disease.
霍乱是一种致命性极强的疾病。
The virus did not mutate to a more virulent form.
病毒没有变异为致命性更强的形态。
This virus was both lethal and virulent.
这种病毒不但致死率高，而且毒性极强。
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。
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。
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。
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。
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