Gynaecology & Obstetrics All of the following mechanisms might account for a reduce risk of upper genital tract infection in users of progestin – releasing IUDs, except : A Reduced retrograde menstruation B Decreased ovulation C Thickened cervical mucus D Decidual changes in the endometrium 💡 Explanation All of the following mechanisms might account for a reduce risk of upper genital tract infection in users of progestin - releasing IUDs, except : ✓ Correct Answer: B. Decreased ovulation