When you come down with a cold, sore throat or the flu, it is pathogens which have caused you the trouble. A pathogen is a biological cause of illness. Pathogens can cause a range of diseases and are divided into four kinds: bacteria, viruses, fungi and parasites.
When you come down with a cold, sore throat or the flu, it is pathogens which have caused you the trouble. A pathogen is a biological cause of illness. Pathogens can cause a range of diseases and are divided into four kinds: bacteria, viruses, fungi and parasites.
How do they get in?
Pathogens can spread and cause disease in a number of ways. These include via the air (coughs and sneezes), bodily contact, an infected wound and food.
Flu every year
Influenza viruses which cause flu are infamous pathogens. The flu can surface again each year. This is because there are lots of influenza viruses which can adapt easily.