Human population growth serves as an important model for population ecologists, and is one of the most important environmental issues of the twenty-first century.
Confidence votes 1. no not all, blood-borne pathogens are typically found in the blood stream and any bodily fluid that can contain blood can contain a blood borne pathogen. these include urine, feces, saliva, sperm, vaginal secretions, and even tears.
1 When they enter your system through water, they cause cholera; when it is through food, then they cause salmonella.  Through Body Fluids: Pathogen can infect you by entering your body through semen and blood. Some of the most common examples of pathogens that spread through body fluids are hepatitis and HIV viruses.