Includes all MRSA topics, and new information.


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 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 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 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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K. pneumoniae

Klebsiella pneumoniae is the specific name of a bacterium that is capable of causing serious illness, especially pneumonia, as the name suggests, in susceptible people.  Klebsiella bacteria are found in several areas of the human body, especially in the intestinal tract, where they do not cause disease, but when circumstances allow, they can be very …

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Escherichia Basics Escherichia is the genus name of a group of bacteria that contains at least 7 different species, although by far the most well-known and well-studied is clearly Escherichia coli (E. coli).  Because E. coli is so common in the environment and in humans, as well as in other animals and because it is …

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Enterococcus is the genus name of a group of bacteria that contains about 20 different species that have been implicated in human disease at some point.  However, the overwhelming majority of such infections result from Enterococcus faecalis (E. faecalis) with most all of the remaining infections being accounted for by Enterococcus faecium (E. faecium).  The …

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Enterobacter Species

Enterobacter Basics Enterobacter is the genus name of a group of bacteria consisting of between 12 and 14 species that are known to potentially cause disease in humans, although other Enterobacter species (sp) certainly exist in the environment without causing any known infections in any other organism.  Enterobacter species are generally members of what is …

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Extended Spectrum Beta-Lactamase Resistant (ESBLR) Enterobacteriaceae

This is a fairly technical and complex issue but we will do our best to make it accessible and comprehensible to the average person.  It is best approached by breaking down the components of the issue into their respective parts. Enterobacteriaceae Basics To start with, the Enterobacteriaceae is the scientific name for a large family …

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