put simply, what you saw in 28 days later applied to women, they enter a state of perpetual intense rage and begin spewing blood while attempting to rip shreds out of the uninfected (the men). luckily it does not contaminate on contact.
period infection stage -
man: you know <woman>.. its such a nice night..
"ahhhhhgtklhky!!!" *tear, rip, bite...gargle*