A very limited number of cellular genes were differentially regulated at 8 h post-infection (i.e. 8 genes modulated at least 2 fold by both virus stocks and 56 genes affected by either NL4-3 wt or NL4-3 ICAM-1+) (Additional file 1), whereas the majority of changes were observed at 24 h post-infection (i.e. 22 genes modulated 2 fold or more by both virus preparations and 363 genes by either NL4-3 wt or NL4-3 ICAM-1+) (Additional file 2). This evidence concerns the gene ICAM1 and infection.