医疗当局对其病因及有多致命都还不甚了解。用英语怎么说？

医疗当局对其病因及有多致命都还不甚了解。

Medical authorities were baffled, both as to its causes and its virulence.

medical

adj. 医学的，医药的，医疗的，内科的；n. 体格检查；

例句
...a Code of Practice that would give patients right of access to their medical records.
允许病人查看自己病历的职业准则

authorities

n. 当局，权力，权威，权威( authority的名词复数 )，权力，学术权威，[复数]当权者；

例句
The authorities have abandoned any attempt to distribute food...
当局中止了分发食物的尝试。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

baffled

adj. 带有障板的，阻挡的；v. 使困难，使为难( baffle的过去式和过去分词 )；

例句
For years this anomalous behaviour has baffled scientists...
几年来这种反常行为让科学家们很困惑。

both

adj. 二者，两者都；pron. 二者；adv. 二者，二者都；conj. 不仅…而且…，…和…都；

例句
The gym can be used by both able-bodied and disabled people.
这家健身房健全和残障人士都可使用。

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

its

pron. (it的所有格形式)它的，厥；

例句
The government is to accelerate its privatisation programme.
政府将加快其私有化计划的进程。

causes

n. 原因( cause的名词复数 )，动机，（某种行为、感情等的）理由，缘故；

例句
Allergy to cats is one of the commonest causes of asthma.
对猫类过敏是哮喘病发作最常见的诱因之一。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

virulence

n. 毒力，毒性，恶意；

例句
N - acylhomoserine lactone ( AHL ), as quorum sensing signals, regulate expression of virulence factors of many plant pathogens.
N - 酰基高丝氨酸内酯 ( N-acylhomoserine lactone, AHLs ) 作为细菌群体感应中的信号分子参与调节植物病原细菌致病因子的表达.