CCL 4 Microbial Contaminants

Microbial Name	Microorganism Type	Diseases and Infections
Adenovirus	Virus	Respiratory illness and occasionally gastrointestinal illness.
Caliciviruses	Virus (includes Norovirus)	Mild self-limiting gastrointestinal illness.
Campylobacter jejuni	Bacterium	Mild self-limiting gastrointestinal illness.
Enterovirus	Viruses including polioviruses, coxsackieviruses and echoviruses	Mild respiratory illness.
Escherichia coli (0157)	Bacterium	Gastrointestinal illness and kidney failure.
Helicobacter pylori	Bacterium	Found in the environment capable of colonizing human gut that can cause ulcers and cancer.
Hepatitis A virus	Virus	Liver disease and jaundice.
Legionella pneumophila	Bacterium	Found in the environment including hot water systems causing lung diseases when inhaled.
Mycobacterium avium	Bacterium	Lung infection in those with underlying lung disease, and disseminated infection in the severely immunocompromised.
Naegleria fowleri	Protozoan	Parasite found in shallow, warm surface and ground water causing primary amebic meningoencephalitis.
Salmonella enterica	Bacterium	Mild self-limiting gastrointestinal illness.
Shigella sonnei	Bacterium	Mild self-limiting gastrointestinal illness and bloody diarrhea.

Contaminant Candidate List (CCL) and Regulatory Determination