Pathogenic viruses are mainly those of the families of: Adenoviridae, Picornaviridae, Herpesviridae, Hepadnaviridae, Flaviviridae, Retroviridae, Orthomyxoviridae, Paramyxoviridae, Papovaviridae, Polyomavirus,Rhabdoviridae, Togaviridae.
Bacteria are harmless or beneficial, a few pathogenic bacteria can cause infectious diseases.
Fungi comprise a eukaryotic kingdom of microbes that are usually saprophytes but can cause diseases in humans, animals and plants.
Protists are a diverse group of eukaryotic microorganisms.
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