Detection of IgM antibodies against Legionella pneumophila serogroup 1 in Malaysian blood donors and patients with respiratory illnesses: evaluation of enzyme-linked immunosorbent assay and indirect immunofluorescence assay. - Tay, S.T.; Lakhbeer Singh, H.K.; Ramasame, Sh.D.; Vadivelu, J. (Institute of Infectious Diseases, 2009)