author={Alan J. Cann},
  journal={Principles of Molecular Virology},
  pages={221 - 259}
  • A. Cann
  • Published 24 July 2015
  • Principles of Molecular Virology
Pathogenicity is the capacity of an organism to cause disease. During virus infections, diseases symptoms arise from two causes, direct injury caused by virus replication and the side effects of the immune response to infection. The balance between these two is variable. The majority of virus infections are asymptomatic and do not cause disease. Only a tiny number of infections cause serious or life-threatening consequences such as immunodeficiency, or tumors. Diseases caused by previously… Expand