Humans and pathogens
The way humans live has had a huge impact on the spread of disease
For example, the fruit bat is thought to be a reservoir for Ebola. The mosquito is a vector of malaria, yellow fever, dengue fever and chikungunya virus.
Living in groups brings potential hosts close together. For example, living with domesticated animals increases the risk of pathogens jumping species. The migration of people and animals means that diseases spread to new areas, and migrants can be exposed to new risks.
Sanitation is a major factor in the spread of disease. Poor sanitation can create environments around humans in which pathogens can multiply and that vector species, such as insects or rodents, find attractive.Lead image:
shellac/Flickr CC BY