Dr. Philippe Bottero is an exceptionally experienced specialist with a strict focus on clinical infectiology and immunology. He has dedicated his life to researching, diagnosing, and treating chronic, multisystemic infectious diseases that are routinely overlooked by conventional laboratories. His daily clinical work includes the millimeter-precise differential diagnostics of highly complex clinical pictures in which masked intracellular pathogens play a destructive systemic role. Through his incomparable experience in the direct, often years-long treatment of desperate patients, he brings pragmatic practical knowledge to the elite scientific discussion surrounding chronic Lyme disease and elusive co-infections. Over the past decades, he established uncompromising, practice-oriented guidelines that define the crucial difference between passive post-infectious syndromes and chronically active, biofilm-forming infections.