T-cells are a critical part of the adaptive immune system, actively targeting problematic invaders.  From pathogens to cancers, T-cells seek and destroy potentially dangerous cells, and maintain a memory of their presence. In today's episode Dr. Nigel McCracken describes this part of the adaptive immune system and how Virax Biolabs is using specialized tests to ascertain the presence and activity of T-cells activated by specific pathogens, such as Epstein-Barr Virus, cytomegalovirus, herpes virus and SARS-CoV2. We discuss the many applications of the technology and how the product pipeline may be employed in disease detection, to assess inflammatory response, and to gauge potential immunity to known pathogens.