TNF and infection: Infection with the epidemic strains also gave rise to a \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\sim$$\end{document}~3-fold reduced TNFα response as compared to SF370 (Fig. 2c).