Pathogen infection research focuses on understanding how pathogens such as bacteria, viruses, fungi, and parasites infect host organisms and cause disease. This research area explores the mechanisms by which pathogens enter and survive within host cells, evade the immune system, and spread throughout the body. Researchers in this field also study how host organisms respond to pathogen infection, including the immune response and the development of vaccines and therapeutics to combat infections. Understanding pathogen infections is important for developing strategies to prevent and treat infectious diseases that pose a threat to human, animal, and plant health.