Taxonomy
Family: Enterobacteriaceae

Natural habitats
Widely distributed in nature, water, soil, dairy products and rarely from clinical samples (feces) from humans and animals

Clinical significance
H. alvei seem to be opportunistic pathogens which produce infections in patients with underlying illness or predisposing factors.

May cause nosocomial infections associated with other bacteria, like septicemia, enteritis, urinary tract infections, pneumonia and abscesses.