Host-virus interaction is a research area that focuses on understanding the interactions between viruses and their host organisms. This field seeks to uncover the molecular mechanisms by which viruses infect and replicate within host cells, evade the immune response, and cause disease. Researchers in this field study how viruses interact with host cells at the cellular and molecular level, as well as the impact of these interactions on the host's immune system and overall health. By understanding these interactions, scientists aim to develop new strategies for preventing and treating viral infections.