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Vasectomies are generally highly effective, but they're not 100 percent foolproof due to a few reasons. One possibility is the presence of recanalization, where the severed ends of the vas deferens can spontaneously reconnect over time. Additionally, if the procedure is not performed correctly or if there are complications during healing, sperm may still be present in the seminal fluid. Lastly, there is a small chance of human error in follow-up tests that confirm sterility.

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3w ago

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