Nearly half of all unintended pregnancies in the United States are due to contraceptive failure, and it’s largely because of inconsistent or incorrect use.

An HIV prevention trial that pre-dates the shift to antiretroviral (ARV)-based approaches is nonetheless helping to answer some of the most relevant and topical questions the field is facing today.

The first large-scale U.S.-based study to evaluate the link between an injectable form of progestin-only birth control and breast cancer risk in young women has found that recent use of a year or more doubles the risk.

Injectable progesterone contraceptives may be associated with poor periodontal health, according to research in the Journal of Periodontology.

CHICAGO, Feb.