NORMAL guinea pig serum is the most common source of complement for the complement-fixation test, and may be used fresh or, more commonly, preserved either by freeze-drying or by Richardson's ...

This signals aggression or agitation. If your guinea pig’s teeth chattering is accompanied by baring of teeth, it is your pet’s way of telling another guinea pig to stay back or back off.

By the increase of amboceptor and the addition of normal inactive homologous or heterlogous serums the deficient serum has been made to act within the usual lytic range of normal guinea-pig serum.