What is the principle surveillance?

Research Assistant, 1972, Senior Research Assistant, 1972-75, and Scientist-S, 1975-76, IVRI, Izatnagar; Junior Scientist (Health), Central Sheep & Wool Research Institute, Avikanagar, 1976-77; Scientist S-1, 1977-82, and Scientist S-2, IVRI, Izatnagar & Palampur, 1982-84; Scientist Incharge, Indian Veterinary Research Institute, Regional Station, Palampur, 1984-90; Deputy Adviser, Animal Husbandry & Dairying, Planning Commission, Yojna Bhawan, Govt. of India, New Delhi, 1990-92; Joint Commissioner (Livestock Health Surveillance), Department of Animal Husbandry & Dairying, Govt. of India, New Delhi, 1992-94; Senior Scientist, Education Division, 1994-96 and Assistant Director General, 1996-2010, Indian Council of Agricultural Research, New Delhi and Animal Husbandry Commissioner, Department of Animal Husbandry, Dairying & Fisheries, Ministry of Agriculture, GOI, New Delhi, 2009-10; Sr. Adviser (Animal Science), International Traceability System Ltd., New Delhi. 2010-13; Senior Consultant (Animal & Aquatic Biotechnology), NER-BPMC, Deptt. Of Biotechnology, New Delhi. 2016- Continuing.