ICTV Classification: → ICTV International committee on Taxonomy of Viruses. The ICTV was established in 1966 as the interna- tional committee on nomenclature of virus. (ICNV), and was again. renamed as international committee on taxonomy of virus (ICTV) in 1977. → ICTV is for only body charged by the international union of microbiological Societies with the task of developing, refining and maintaining a virus taxonomy. universal →viral, classification starts at the level of order and continues as in italics; follows, with the taxon suffixes given order → [-viraleg] Family → [-viridae] Sub-family→ [-virinae] genus → [-virus] Species → [Species narnes generally taken the form of [disease-virus → According to ICTV, the establishment of an order is based on the inference that the virus families it contains and have most likely evolved from a common ancestor. →The majority of virus families remain unplaced. As of 2015, 7-orders 96-Families, 22-Sub families 420- genera and 2618 Species of Viruses have been defined by ICTV. →The orders Ligamenvirales are caudovirales, Herpes viracles, mononega virales nido virales, Picorno- virales and Tymovirales. →These order span viruses with varying host - ranges. →The Ligamen virales, infecting archaea , are the most recent addition to the classification system............ →So, Seven orders. have been established. by the ICTV. They are; 1. caudo virales;- Are tailed double Stranded DNA (group-I] bacteriophages. 2: Herpes virales:-... It contains large eukaryotic double stranded DNA viruses. 3. Ligamen virales:- It contains meno parazite (xy linear, double stranded DNA [group-1] archaean viruses. 4- Mononega virales:- It include non- Segmented(-) Strand (group-v) plant El animal viruses. Single Stranded RNA 5. Nido virales :- They are. composed of (1) Strand single stranded RNA (group-iv) viruses with vertebrate hosts. 6. picomo virales :- It contains small (1) Strand single Stranded RNA viruses that infects a variety of plant: $1. msects and animal host. 7. Tymo virales It contains monopartite, (+) single stranded RNA viruses that infects plants. Objectives of ICTV System are, *The objectives of the international committee on taxonomy of viruses are; 1. To develop for viruses. an internationally agreed taxonomy 2. To establish internationally agreed names for virus taxa, including species and sub-viral agents.. 3. To maintain communicate taxonomic decisions to all user's of virus names, in particular the international community of virologist, by publications and via the internet. To maintain To maintain an index of vines names.. an ICTV data base on internet, that records the data that characterize each named viral taxon, together with the common Eaxon in all the major languages. names of each