Haemophilus, Aggregatibacter, Cardiobacterium, Eikenella, Kingella (HACEK)

Cavalier-Smith in Cavalier-Smith et al., 2004
Cavalier-Smith in Shalchian-Tabrizi et al., 2008
Cavalier-Smith in Cavalier-Smith et al., 2010
Cavalier-Smith in Cavalier-Smith et al., 2013