Severity of E. coli mastitis is mainly determined by cow factorsChristian Burvenich, Valérie Van Merris, Jalil Mehrzad, Araceli Diez-Fraile and Luc DuchateauVet. Res., 34 5 (2003) 521-564DOI: https://doi.org/10.1051/vetres:2003023