Case 191. Reference case 191A

　 　 　 　
　 Cross section of spiruroid nematode larva, showing multinucleated gut epithelium and cross-striated cuticle (HE, higher power). 　
　 　 　 　

　

 　 The transmission can be avoided by freezing of the squid or preservation under high salt concentration. The incidence of this disease is thus decreasing.