Parent strain (SE#15h strain):

SE strains isolated from egg production farm environments (dust) and passaged and stored at CAF laboratories (phage type, 1 strain).

SE#15e strain:

The SE#15h strain supplied to Osaka University of Pharmaceutical Sciences and returned after several passages.

SE#15h-m

The SE#15h strain was administered orally to BALB/c mice. Four colonies were isolated from the digestive tractsof mice and named as the SE#15h-m strain.

SE#15h-c

The SE #15h strain was inoculated via the intranasal route in laying hens. Four colonies were isolated from the chicken cecum and named as the SE#15h-c strain.

SE Y-24 strain:

The SE strain supplied by Osaka Prefecture University (a patent strain).

SE strains derived from human patients: Formalin-treated SE strains supplied by Izumiya of the National Institute of Infectious Diseases.