Volume 8, Number 2—February 2002
Lack of Evidence for Human-to-Human Transmission of Avian Influenza A (H9N2) Viruses in Hong Kong, China 19991
|Patient||Age (years)||Sex||Serologic anti-H9 response|
|Days post symptom onset||Neutralizing antibody titera||Western blotb||ELISA IgGc||ELISA IgMc|
aTiters expressed as the geometric mean of four replicate titers; titers ≥80 were considered positive for anti-H9 antibodies.
bWestern blots were performed by using a purified baculovirus-expressed recombinant HK/1073 HA as antigen.
cEnzyme-linked immunosorbent assay (ELISA) immunoglobulin (Ig) G and IgM antibodies were detected on plates coated with purified baculovirus-expressed recombinant HK/1073 HA (1 μg/mL). Titers are expressed as the geometric mean of duplicate endpoint titers estimated as described in Methods. A titer ≥1,600 was considered positive for anti-H9 antibodies.
1Presented in part at the International Conference on Emerging Infectious Diseases 2000, Atlanta, Georgia, July 2000 (Poster #55), Session 7, July 16-19, 2000.