BRSV persistence in dairy herds is therefore a matter of individual persistence rather than population persistence. This outcome has relevance for disease combat strategies. It was suggested that with improved diagnostic instruments such as RT-PCR it would be feasible to detect in a more sensitive manner the RNA of BRSV and hence persistent BRSV sources. In the field of economics, much time has been devoted to theoretical work. First, the theory of risk and decision making under risk has been extended.
Risk is an inescapable factor in veterinary decision making.
All these factors must be managed to achieve satisfactory results. A book has been written and published in this field. Secondly, the theory of animal health economics has been extended. This covers a broad spectrum of issues, including a theoretical framework with basic and advanced methods of economic analysis. The first group includes partial budgeting, cost-benefit analysis and decision analysis.