Editing Human pathogen (section)

==Transmission==
{{main|Transmission (medicine)}}
Transmission of pathogens occurs through many different routes, including airborne, direct or indirect contact, sexual contact, through blood, breast milk, or other body fluids, and through the fecal-oral route. One of the primary pathways by which food or water become contaminated is from the release of untreated sewage into a [[drinking water]] supply or onto cropland, with the result that people who eat or drink contaminated sources become infected. In [[developing countries]], most sewage is discharged into the environment or on cropland; even in [[developed countries]], some locations have periodic system failures that result in [[sanitary sewer overflow]]s.<ref>{{Cite journal |last1=Hrudey |first1=Steve E. |last2=Hrudey |first2=Elizabeth J. |last3=Pollard |first3=Simon J. T. |date=2006-12-01 |title=Risk management for assuring safe drinking water |url=https://www.sciencedirect.com/science/article/pii/S0160412006000821 |journal=Environment International |language=en |volume=32 |issue=8 |pages=948–957 |doi=10.1016/j.envint.2006.06.004 |pmid=16839605 |bibcode=2006EnInt..32..948H |hdl=1826/1519 |issn=0160-4120|hdl-access=free }}</ref>