What best describes pathogens?

Pathogens are organisms that cause disease. They can be bacteria, viruses, fungi, or parasites. Pathogens can spread through the air, water, food, or contact with an infected person or animal. Some common examples of pathogens include:

* Bacteria: Salmonella, E. coli, Streptococcus pneumoniae

* Viruses: Influenza virus, human immunodeficiency virus (HIV), measles virus

* Fungi: Candida albicans, Aspergillus fumigatus

* Parasites: Plasmodium falciparum (causes malaria), Taenia solium (causes tapeworm infection)

Pathogens can cause a wide range of symptoms, depending on the type of pathogen and the person's immune system. Some common symptoms of infection include:

* Fever

* Cough

* Sore throat

* Diarrhea

* Vomiting

* Fatigue

* Muscle aches

* Headaches

In some cases, infections can be life-threatening. It is important to see a doctor if you are experiencing any symptoms of infection.