Epidemiology of contemporary seroincident HIV infection in the Navy and Marine corps.

Human Immunodeficiency Virus (HIV) infection continues at a steady rate among U.S. Sailors and Marines.

A closed-loop reduced oxygen breathing device for inducing hypoxia in humans.

Background: Hypoxia poses a documented threat to aerospace and diving operations in healthy people and is a component of many clinical conditions. Practical training for aircrew, and research on clinically relevant hypoxic conditions frequently rely exclusively on large, expensive hypobaric chambers.

Purpose: Here we describe and report the efficacy of a compact, economical, closed-loop rebreather-type reduced-oxygen breathing device (ROBD) for hypoxia induction in humans.