Money for studying minor viruses

We need money for research. To obtain the money, we should show research plans that are very useful for improvement of human health. Accordingly, researches about human immunodeficiency virus, influenza virus and herpesviruses develop, because they cause severe influence to human society. It is basically difficult to obtain a budget for minor viruses research because they are usually thought to be not so important for human being. How do we get money for studying such minor viruses? One of the method to study a minor virus is to use a part of budget for major viruses to minor viruses research, by which, we can find some important discoveries regarding both minor viruses and major viruses, which is not so rare.