Necrotizing fasciitis, commonly known as the "flesh-eating bacteria," is contagious by contact with mucus or saliva from an infected individual, according to HealthLinkBC. Different types of bacteria cause necrotizing fasciitis, but the most common source of the disease is the group A streptococcus bacteria.
The CDC describes necrotizing fasciitis as a severe bacterial infection that quickly spreads and destroys body tissue. Group A streptococcus bacteria infections are usually mild, but on rare occasions their toxins destroy infected body parts. Necrotizing fasciitis requires an accurate diagnosis with prompt antibiotic treatment and surgery. People with proper hygiene, adequate wound care and a strong immune system have minimal risk of getting the disease.