Confused about Voluntary Acknowledgment of Paternity (VAP)? It's a common way to establish paternity, often done right at the hospital. Here's what you need to know: 1 What Is VAP? It's Ventilator Associated Pneumonia (VAP) Ventilators for Coronavirus: What Are They, How They Work, and When to Use Them Ventilator Associated Events: What They Are and What They Are Not Michael Klompas, 2019