Semenova I.B. (Семёнова И.Б.) is still active as a researcher, because his latest paper is dated November 2015. So it might be possible to contact Semenova by email and ask him what he means by "purified staphylococcal toxoid" in his published papers. Here is a lecture given by Semenova I.B., but unfortunately it has no email contact details.
@Hip were you ever able to contact Semenova? Or get a second round of new un-damaged vaccines to test?