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"worried by" is correct and can be used in written English.
You can use it when you want to express that someone is anxious or concerned about something. For example: "He was worried by the thought of having to give a presentation in front of a large group of people."
Exact(59)
"I am worried by this.
I am not worried by that".
Feminists are deeply worried by the trend.
He is not worried by others' perceptions.
I'm worried by your book.
"I'm not worried by the threats.
Is he worried by the pandemic?
"So we're not worried by that.
Obama apparently wasn't worried by the association.
"We are very worried by this development.
Tom Rob Smith is worried by cranberries.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com