What are pathogens


Synonyms: pathogen, infectious agent
English: pathogenic

1 definition

Pathogens are micro- or macro-organisms that set harmful processes in motion in other organisms ("hosts") for their own benefit. This property is called pathogenicity in medicine. Pathogens that are relevant to humans are called human pathogens.

2 pathophysiology

In principle, pathogens trigger three different reactions:

The severity of the reaction triggered by the pathogen depends on both the susceptibility (susceptibility) of the patient and the pathogenicity (harmfulness) of the pathogen. The contagiousness of a germ describes its ability to be transmitted between individuals. Infectiousness has the potential to use the "chance" in the event of contact and to induce an infection.

3 classification

The pathogens can be divided into 5 major classes:

3.1 bacteria

3.2 Viruses

3.3 mushrooms

3.4 parasites

3.4.1 Endoparasites

3.4.2 Ectoparasites

3.5 prions

4 organotropy

Because of their specific properties (metabolic requirements, receptors, exotoxins, etc.), pathogens often have an affinity for certain tissues in the human body. The property is called organotropy. One differentiates, for example: