Thanks for posting your query on DoctorSpring.com.
I am Dr.R.K and I am pleased to assist you.
Helicobacter pylori is transmitted from one person to another by oro-oral and feco-oral route. A person can get recurrent helicobacter pylori infection but the incidence of reinfection is low.
You can get retested only if you have recurrence of symptoms.
There is no fixed time interval for the recurrence of this infection. You can get it anytime.
However, if you do not have any symptoms, then you are unlikely to have it.
I hope that answers your question.
Let me know if I can assist you further.