"Domestic animals contaminate recreational waters and drinking-water sources with excreta and pathogens; but this threat to public health is inadequately understood and is insufficiently addressed in regulations. More than 85% of the world's faecal wastes is from domestic animals such as poultry, cattle, sheep and pigs. These animals harbor zoonotic pathogens that are transported in the environment by water, especially runoff. However little information...

Say a patient dies from a terrible disease that no one can identify. That's a job for experts in infectious diseases, who study the patient's blood and body fluids and try to identify the disease and stop it from claiming more lives!