Reply or response should be supported by valid reference or reasoning.
Should there be vaccination in the face of a disease outbreak in a population where there are disease cases and obviously infected individuals?
WHO defines vaccination as, "Vaccination is a simple, safe, and effective way of protecting you against harmful diseases before you come into contact with them." (https://www.who.int/news-room/questions-and-answers/item/vaccines-and-immunization-what-is-vaccination).
In Chapter 4.18 of OIE - Terrestrial Animal Health Code - 10/08/2022, you can do a Ring vaccination around a herd of infected animals to contain the disease in animals susceptible to the disease (certainly still not infected).
In the book, "Trends in Emerging Viral Infections of Swines, Kyoung-Jin Yoon, Jeffrey J. Zimmerman, Antonio Morilla · 2008", it is stated on page 162 Section 5 on Classical Swine Fever Virus that, "Vaccination in Infected herds helps spread field virus". and also, "In endemically infected, vaccinated herds, there is selection for low-virulent CSFV strains".
Please share your views with references if any.
In the case of clinical cases vaccination not advise because it act as stress beside silent infection in contact animals give immune response better than vaccine
Usually yes, if there is a safe and effective vaccine. However there are many nuances to this which depend on the natural history of infection and on the characteristics of the vaccine. Points to take into account are, for example, what is the goal of vaccination (stop the spreading? avoid severe disease? other?), how risky (or desirable) is to vaccinated unknowingly infected individuals, what is the risk/cost-benefit balance of vaccination, should only some risk groups be vaccinated (elderly, immunocompromised...), are there alternatives to vaccination, and so on so forth.
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