Bacteria Explorer

Coronavirus

Coronavirus refers to a relatively small group of viruses that were first identified in the 1960s from the respiratory tracts of humans.  Over the course of time, it was recognized that coronavirus infection is quite common in humans, as well as in some other animals, although those viruses do not always have the ability to …

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Staphylococcus

Staphylococcus is the genus name of a very large group of closely related bacteria, some of which are commonly found on and in the human body, and some of these bacteria are notorious causes of infection and disease. Among the most common of these bacteria that are capable of causing disease are Staphylococcus aureus and …

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Shigella

Shigella is a genus group of bacteria that contains four species, S. dysenteriae, S. flexneri, S. boydii, and S. sonnei.  While these are frequently referred to as “species,” it is probably more scientifically correct to refer to them as biotypes of Escherichia, but because of the important medical differences between infections with Shigella versus most …

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Serratia

Serratia is the genus name of a group of relatively common bacteria, the most common of which is Serratia marcescens.  There are other species within the genus, a few of which have on rare occasion caused disease in humans, but the vast majority of infections with the Serratia occur with Serratia marcescens, and from this …

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Salmonella

Salmonella is the genus name of a large group of bacteria which however contains only two distinct species.  Unlike many bacterial genus groups the distinctions among the many, at last count 2,501, individually recognized types of Salmonella are not species but instead are known as serovars, or serological variants.  These variants are recognized by differing …

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Pseudomonas

Pseudomonas is the genus name of a large group of bacteria, some of which can infect and sicken humans.  The number of bacteria assigned to Pseudomonas has declined in recent years as the advent and widespread adoption of genetic testing of bacteria has caused many former members of Pseudomonas to be moved to existing, or …

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Listeria

Listeria monocytogenes is one specific genus and species pair of bacteria.  There are five additional species within the Listeria genus, but only one of these, L. ivanovii, in addition to L. monocytogenes, is considered to be a pathogen, or capable of causing disease.  L. ivanovii is not nearly as common an infection however and it …

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Legionella

Legionella is the genus name of a large group of bacteria capable of causing, potentially severe and even fatal, disease in humans. While there are now over 40 named species and some 60 additional serogroups within those species, only about half of them have been implicated in human disease, the most common cause being Legionella …

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