Sensitivity of H7 antigen detection in the dual ELISA. Tested viruses with an HA titer of 16 were twofold diluted and subjected to the dual ELISA for antigen detection. Values represent the means of absorbance of duplicate wells from two independent tests. OD 490: optical density at 490 nm; dotted line: cut-off values.
He et al. BMC Microbiology 2013 13:219 doi:10.1186/1471-2180-13-219