Has cross-reactivity in ELISA with: H7N9 (A/Anhui/1/2013) HA Protein; H7N9 (A/Hangzhou/1/2013) HA Protein; H7N9 (A/Hangzhou/3/2013) HA Protein; H7N9 (A/Pigeon/Shanghai/S1069/2013) HA Protein; H7N9 (A/Shanghai/1/2013) HA Protein; H7N9 (A/Shanghai/2/2013)