Hand Hygiene Environmental Contamination Prevention/Infection Source Control Standard Precautions Contact Precautions Droplet Precautions Airborne Precautions Respiratory Hygiene/Cough Etiquette Diseases/Conditions Requiring Precautions. Appendix A: Donning and Removing Personal Protective Equipment (PPE). Appendix B: Institute for Health Improvement (IHI) Bundles: Central Line Bundles and Ventilator-Associated Pneumonia (VAP) Bundles.