Comparative Serological Assays for the Study of H5 and H7 Avian Influenza Viruses

Table 2

Comparison between pp-NT assays using different reporter systems (GFP and CSFLW luciferase) and HI tests. IC₅₀-neutralizing antibody titres tested by A/Vietnam/1194/04 and A/Egypt 1709-01/07.

Sera no.	HI	IC50; A/Vietnam/1194/04; GFP-pp	IC50; A/Vietnam/1194/04; Luc-pp	IC50; A/Egypt 1709-01/07; GFP-pp	IC50; A/Egypt 1709-01/07; Luc-pp
3933-42	1 : 8	<40	80–160	80–160	80–160
3933-50	1 : 16	<40	640–1280	160–320	80–160
3933-41	1 : 32	<40	640–1280	320–640	1280–2560
3930-20	1 : 64	160–320	2560–5120	640–1280	2560–5120
3931-26	1 : 128	80–160	640–1280	1280	5120–10240
3930-19	1 : 256	40–80	2560–5120	>1280	5120–10240
3929-6	1 : 512	>1280	>10240	>1280	2560–5120
3929-9	1 : 1024	>1280	5120–10240	>1280	>10240
3929-1	1 : 2048	>1280	>10240	>1280	>10240