Infections by type of pathogen Protozoan Disease and Transmission Microbial Agent Sources of Agent in Water Supply General Symptoms Protozoan () (Cyst-like appearance) , , in water supply, saliva transfer(if the other person has the disease) Abdominal discomfort, , weight loss, , , (oral) Protozoan () Collects on water filters and membranes that cannot be , , seasonal of water. , watery diarrhea, loss of appetite, substantial loss of weight, , increased gas, Protozoan parasite (Cyclospora cayetanensis) , , nausea, , muscle aches, fever, and fatigue (fecal-oral) Protozoan () Most common intestinal parasite Untreated water, poor disinfection, pipe breaks, leaks, contamination, where humans and wildlife use same source of water. and create that act as for Giardia. Diarrhea, abdominal discomfort, , and Protozoan phylum (), but closely related to has been detected in , the origin of drinking water Diarrhea and in individuals. Bacterial[edit] Disease and Transmission Microbial Agent Sources of Agent in Water Supply General Symptoms Bacteria can enter an open wound from contaminated water sources. Can enter the gastrointestinal tract through consumption of contaminated or (more commonly) food Dry mouth, and/or , difficulty swallowing, muscle weakness, difficulty breathing, slurred speech, vomitingand sometimes . Death is usually caused by .
Most commonly caused by Drinking water contaminated with Produces like symptoms along with a . Usually lasts 2–10 days. Spread by the bacterium Drinking water contaminated with the bacterium In severe forms it is known to be one of the most rapidly fatal illnesses known. Symptoms include very watery diarrhea, , , , rapid , vomiting, and (in severe cases), at which point death can occur in 12–18 hours. Certain strains of (commonly E. coli) Water contaminated with the bacteria Mostly diarrhea. Can cause death in individuals, the very young, and the elderly due to dehydrationfrom prolonged illness. Naturally occurs in water, most cases from exposure in or more frequently ; rare infection since it mostly infects individuals Symptoms include typically located on the elbows, knees, and feet (from ) or lesions on the hands (). Lesions may be painless or painful. Caused by a number of species in the genera Shigella and with the most common being Shigella dysenteriae Water contaminated with the bacterium Frequent passage of with and/or and in some cases vomiting of blood. (two distinct forms: Legionnaires' disease and Pontiac fever) Caused by bacteria belonging to genus (90% of cases caused by ) Legionella is a very common organism that reproduces to high numbers in warm water;[7] but only causes severe disease when aerosolized. Pontiac fever produces milder symptoms resembling acute without . Legionnaires' disease has severe symptoms such as , , pneumonia (with cough that sometimes produces ), , , muscle aches, and occasionally diarrhea and vomiting Caused by bacterium of genus Leptospira Water contaminated by the animal urine carrying Begins with then resolves. The second phase then occurs involving , damage (causes ),
the bacteria and (swimmer's ear) Caused by a number of and fungalspecies. Swimming in water contaminated by the responsible pathogens swells, causing pain and tenderness to the touch Caused by many bacteria of genus Drinking water contaminated with the bacteria. More common as a . Symptoms include , , vomiting, and abdominal cramps Ingestion of water contaminated with of an infected person Characterized by sustained fever up to 40 °C (104 °F), profuse ; diarrhea may occur. Symptoms progress to , and the and enlarge if untreated. In this case it can last up to four weeks and cause death. Some people with typhoid fever develop a rash called "rose spots", small red spots on the abdomen and chest. , , and Can enter from contaminated water. Also acquired by drinking contaminated water or eating undercooked . Symptoms include abdominal tenderness, agitation, bloody stools, chills, confusion, difficulty paying attention (attention deficit), delirium, fluctuating mood, hallucination, nosebleeds, severe fatigue, slow, sluggish, lethargic feeling, weakness. Viral[edit] Disease and Transmission Viral Agent Sources of Agent in Water Supply General Symptoms (Severe Acute Respiratory Syndrome) Manifests itself in improperly treated water Symptoms include , , , , , and sore throat