What is a pathogen

Not all microbes are bad for people, only those which can cause a disease. These microbes are called pathogens and require a host to feed on, which usually triggers an immune response from a living organism. 

Disease-causing microbes belong to the following groups: fungus, bacteria, protozoa and virus. Even within each of the groups, not every representative is a pathogen. For example, only 1% of all bacteria are pathogenic. However, when it comes to viruses, most of them are pathogenic.

When a pathogen invades a host, it is called infection. When the said infection results in some form of damage to a host’s organism, the host is said to have a disease. What is important to understand is that not all infection will lead to a disease. 

For example, someone could be infected with the novel coronavirus (SARS-CoV-2), but never develop a disease(COVID-19). 

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