Medicago AB Products are Available Worldwide. The Encephalitozoon cuniculi (E. cuniculi) antigen suspension consists of about 3x10 7 spores per ml. The spores, inactivated by formalin, are washed and suspended in phosphate buffered saline solution (PBS) containing 0.1% formalin. The E. cuniculi antigen suspension is to be used together with carbon suspension in Medicago's CIA test. For laboratory use only. For laboratory use only. 1 mL. More information available on our website.