Social & Preventive Medicine A man underwent vasectomy, but 6 months later his wife was 16 weeks pregnant. What is the most likely cause? A Failure of operative procedure B Pregnancy antedating vasectomy C Recanalization of vas D Failure to use additional contraception in postoperative period 💡 Explanation A man underwent vasectomy, but 6 months later his wife was 16 weeks pregnant. What is the most likely cause? ✓ Correct Answer: A. Failure of operative procedure