[1] Univ Port Harcourt, Dept Haematol & Immunol, Port Harcourt, Nigeria
[2] Rivers State Univ Sci & Technol, Med Lab Sci Dept, Port Harcourt, Nigeria
[3] Royal Bolton Hosp NHS Trust, Blood Sci Dept, Bolton, Lancs, England
[4] Univ Port Harcourt, Dept Microbiol, Port Harcourt, Nigeria