These include cases of severe human disease due to highly pathogenic avian influenza A H5N1 that have been occurring since 2003 .
Explanation:
<h3>What is pathogenic ?</h3>
Any organism or agent that can cause disease is referred to as a pathogen in biology in the widest and oldest definition. Another name for a pathogen is an infectious agent or just a germ.
In the 1880s, the word "pathogen" first became in use. An infectious microbe or agent, such as a virus, bacterium, protozoan, prion, viroid, or fungus, is typically referred to as a pathogen. Insects and helminths are examples of small animals that can carry or spread disease. Instead of being called pathogens, these creatures are more commonly referred to as parasites. Microbiology is the scientific study of microscopic organisms, especially microscopic harmful organisms, while parasitology is the study of parasites and the hosts of parasites.
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