It is sometimes known as "Chinese QX," as it was originally isolated after disease outbreaks in China's Qingdao region in the mid-1990s.
ບາງຄັ້ງມັນຖືກເອີ້ນວ່າ "QX ຂອງຈີນ" ຍ້ອນວ່າມັນຖືກແຍກອອກຈາກເດີມຫຼັງຈາກການລະບາດຂອງພະຍາດໃນເຂດ Qingdao ຂອງຈີນໃນກາງຊຸມປີ 1990.