grammaticality - Inversion in "Only when the virus introduces its nucleic acid into a cell does disease occur"


Given this sentence,



Disease occurs only when the virus introduces its nucleic acid into a cell.



Is the following inversion grammatical?



→ Only when the virus introduces its nucleic acid into a cell does disease occur.



Especially the "does disease occur" part.


I think that "occurs disease " is right. Can you explain a rule about this kind of sentence?




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