Abstract: This invention relates to recombinant human antibody molecules for use in a method of treatment of Acinetobacter infection. The antibodies bind Acinetobacter antigens, for example from Acinetobacter spp. Human antibody encoding genes targeting clinically relevant Candida epitopes have been isolated from single B cells from carefully selected donors and screened with specified types of protein or cell wall extract. The panel of purified, fully human recombinant IgG1 mAbs generated displayed a diverse range of specific binding profiles and demonstrated efficacy in a disease model. The fully human mAbs and derivatives thereof have utility in the generation of diagnostics, therapeutics and vaccines.