Applications:This invention presents serious of monoclonal mouse IgG and IgM antibodies against yellow fever virus and dengue fever, and the antibody-producing hybridoma cell lines. These antibodies have multiple applications in production of vaccine against yellow fever.Advantages:These antibodies have been proved to be very helpful in testing, quality control, and manufacturing vaccines against yellow fever and dengue fever. Antibodies available are for NS1 and E protein of dengue and yellow fever virus.