“…The species has been subdivided into three biotypes on the basis of differences in biochemical properties, such as indole production and cellobiose fermentation, as well as serological and genetic traits and host range (Tison et al, 1982;Bisharat et al, 1999Bisharat et al, , 2007. Biotypes 1 (BT1) and 3 (BT3) are considered human pathogens and biotype 2 (BT2) pathogens of aquatic animals (Tison et al, 1982;Song et al, 1990;Biosca et al, 1996Biosca et al, , 1997Bisharat et al, 1999;Fouz et al, 2002Fouz et al, , 2006aFouz & Amaro, 2003) in spite of the fact that several human cases of wound infection and sepsis due to BT2 have occurred worldwide (Veenstra et al, 1992;Dalsgaard et al, 1996). BT2 was first isolated in Japan in 1976 (Muroga et al, 1976) and was described in 1982 by Tison et al (1982).…”