From是可以省略的。
prevent
及物动词，意为“防止，预防”，后接名词、代词等作宾语。常用prevent sb (from) doing sth“防止某人做某事”句式。这里的from是可以省略的。
例如：
Doctors and nurses will help us preventdiseases.
医生和护士将会帮助我们预防疾病。
Nothing could prevent me (from) workinghard.
没有什么能阻止我努力工作。
protect sb from doing sth 中的from可以省略吗 prevent sb
protect sb from doing
sth这里的from不能省略。
protect...from…是表示保护。。。不受伤害。from后接能带来伤害或损害之物。
所以是：
Protect sb/sth from sth/doing sth
例句：
You had better wear sunglasses to protect your eyes from the sun.
Hair can protect our heads from being hurt.
注意：
prevent sb from doing sth与stop sb fromdoing sth用法相同，在主动语态中from可以省略，
被动语态中不行。keep...from在表示此意时，from不可以省略。keep。。doing 是使。。处在。。状态中的意思。如果没有了from就变成了keep sb doing sth了，意思就反过来了。
prevent的用法
【prevent】用法
1. VERB 防止To prevent something means to ensure that itdoes not happen.
These methods prevent pregnancy...
这些方法能防止怀孕。
Further treatment will prevent cancer from developing...
进一步的治疗将阻止
癌症恶化。
We recognized the possibility and took steps to prevent it happening.
我们认识到了这种可能性，并且采取了一些预防措施。
2. VERB 阻止；制止；阻碍 To prevent
someone from doing something means to make it impossible for them to do it. →ee usage note at: avoid
He said this would prevent companies from creating new
jobs...
他说这将使公司无法创造新的工作机会。
Its nationals may be prevented from leaving the country...
其国民可能会被禁止出境。
The police have been trying to prevent them arrying weapons.
警方一直都设法阻止他们携带武器。
3）词组用法
“prevent” + something
“prevent”+某事
The soldiers prevented the evacuation.
例句：士兵们阻止撤离。
“prevent” somebody from + -ing“prevent”某人做某事
The soldiers prevented the refugees from evacuating.
例句：士兵们阻止难民们撤离。