id author title date pages extension mime words sentences flesch summary cache txt cord-010336-xfzf7ath Lambertz, Ruth Lydia Olga H2 influenza A virus is not pathogenic in Tmprss2 knock-out mice 2020-04-22 .txt text/plain 3234 206 61 For in vivo studies, female Tmprss2 −/− (B6.129S1-Tmprss2tm1Tsyk) [12, 14] and C57BL/6 JRj wild type (WT) mice (Janvier, 8-12 weeks old) were infected intranasally with 2 × 10 4 ffu PR8_HA(H2) as described before [12] and changes in body weight and survival were monitored for the next 14 days. Viral replication in lungs of infected (dose of 2 × 10 4 ffu) female Tmprss2 −/− and WT mice (8-12 weeks old) revealed no detectable virus replication in Tmprss2 −/− mice, whereas WT mice showed increased lung titers at day 2 and 4 post infection (dpi) (Fig. 2c) . Since no viral replication and only minor immune responses were detected in the studies described above, we confirmed that mice had indeed been infected with the PR8_HA(H2) virus by determining the presence of H2-specific antibodies at 14 dpi in the serum. ./cache/cord-010336-xfzf7ath.txt ./txt/cord-010336-xfzf7ath.txt