spiked over this conspiracy theory

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GoodTaste

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Chinese search traffic for US base spiked over this conspiracy theory

Source: CNN

I understand "spiked over this conspiracy theory" as "surged on the topic of the conspiracy theory." Am I on the right track?
The definition of spike:"to rise or increase sharply" - is it suitable here?
 
You have the right definition of “spiked.”

In this sentence, “over” is more like “because of.” It does not mean “on the topic of.”
 
It also happened quickly.
 
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