Rigvir viral therapy was developed in Latvia and has seen success is treating cancer patients. It is a live non-pathogenic ECHO-7 virus which has an affinity for tumor cells. It replicates in the tumor cells and destroys them. Rigvir improves the survival rates in patients with cancer and improves their quality of life.
Rigvir is approved by the State Agency of Medicines of the Republic of Latvia. Rigvir is also approved in Uzbekistan, the Republic of Georgia, and Armenia. Tumor virotherapy (using a genetically engineered herpes simplex type 1–derived virus called talimogene laherparepvec) has recently been added as a cancer treatment tool in the USA.