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Helicobacter pylori

Helicobacter pylori - Gram-negative, spiral to pleomorphic, spiral rod prokaryote. Magnification 2,200, Scanning electron microscope. This bacterium can move by means of tiny flagella at the end of the cell. There are many strains of H. pylori which are distinguished by the human disease with which they cause. H. pylori infection is the main cause of chronic superficial gastritis and it is associated with both gastric and duodenal ulcers. It lives in the interface between the surface of gastric epithelial cells (the lining of the stomach). It often clusters at the junctions of epithelial cells. Courtesy of Dennis Kunkel.

La Crosse encephalitis virus

Negatively-stained transmission electron microscopy (TEM) image of La Crosse encephalitis (LAC) virus ribonucleoprotein particles. This virus belongs to the Bunyaviridae family and causes La Crosse virus (LACV) disease (La Crosse encephalitis). La Crosse encephalitis is a rare disease with symptoms including headache, fever, fatigue, nausea, vomiting and lethargy. Human infection is most commonly via mosquito bites. Image courtesy of the Centers for Disease Control and Prevention (CDC / Dr. J. Obijeski).

Featured Items

The Encyclopedia of Earth (EoE).
Archaea are a domain of single-celled microorganisms. They have no cell nucleus or any other organelles inside their cells.

By Scientific American.
Bacteria live on our eyeballs, and understanding their role could help treat common eye diseases.

By The Encyclopedia of Earth.
Algae comprise a diverse group of typically autotrophic organisms, ranging from unicellular to multicellular forms.

The German Mycological Society promotes both German and international level scientific development of medical and veterinary mycology.

A non-profit corporation providing continuing medical education to medical doctors in California with an interest in clinical infectious diseases.

This fungus belongs to the Ascomycota phylum and causes botrytis bunch rot or gray mold. The condition reduces the quantity and quality of the infected plant and causes heavy economic losses. It affects a wide variety of cultivated and wild plant species but most notable wine grape plants.

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