from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A nonmotile, gram-positive bacterium (Streptococcus pneumoniae) that is the most common cause of bacterial pneumonia, associated with meningitis and other infectious diseases.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A gram-positive bacterium, Streptococcus pneumoniae, that causes pneumonia and other infectious diseases

from the GNU version of the Collaborative International Dictionary of English

  • n. A form of micrococcus found in the sputum (and elsewhere) of persons suffering with pneumonia, and thought to be the cause of this disease.

from The Century Dictionary and Cyclopedia

  • n. A diplococcus which is regarded as the causative factor of acute croupous pneumonia. Also termed diplococcus pneumoniæ or Fraenkel's pneumococcus. See diplococcus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. bacterium causing pneumonia in mice and humans


from Wiktionary, Creative Commons Attribution/Share-Alike License

pneumo- + -coccus


  • Protection against pneumococcus is mediated by antibodies directed against the pneumococcal polysaccharide.

    Pneumococcus Vaccine

  • (link) One pneumococcus is enough to spoil a party, alas.

    mrissa: On the twelfth day of illness, this virus gave to me...

  • By studying the lungs of 77 patients that died from confirmed H1N1 flu, they were able to document the involvement of bacteria from 29% of the patients, and one bacterium, called pneumococcus, was responsible for almost half of the bacterial infections.

    Dr. Orin Levine: The Low Hanging Fruit of Pandemic Flu Prevention

  • A bacteria called pneumococcus that accounts for about 1.5 million worldwide deaths each year on its own, is one of the most common bacterial causes of these pneumonia cases.

    Dr. Orin Levine: The Low Hanging Fruit of Pandemic Flu Prevention

  • Pneumococcus Streptococcus pneumoniae, also known as pneumococcus, kills more than 1 million children a year around the world.


  • And the extra one we want to talk about is pneumococcus, which is a dangerous bacterial infection.

    CNN Transcript Oct 7, 2006

  • It is a tiny, inoffensive-looking little organism, of an oval or lance-head shape, which, after masquerading under as many aliases as a confidence man, has finally come to be called the pneumococcus, for short, or "lung germ."

    Preventable Diseases

  • China, we also developed the 24-valent PPV to cover one more serotype of pneumococcus, which is one of the top three most prevalent pneumococcus bacteria in China, and therefore has the potential to provide more extensive vaccine protection to the Chinese population.

  • "Streptococcus pneumoniae, commonly known as pneumococcus, is responsible for half the cases of bacterial meningitis in humans," said the study's senior author, Victor Nizet,


  • Remember, bacteria such as pneumococcus and Haemophilus influenzae type b (Hib) can also cause meningitis.

    Meningococcus Vaccine


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  • "Although many bacteria, viruses, and fungi can invade the lung, the single most common cause of pneumonia is the pneumococcus, a bacterium that can be either a primary or a secondary invader. (It causes approximately 95 percent of lobar pneumonias, involving one or more lobes, although a far lesser percentage of bronchopneumonias.) ... Under the microscope the pneumococcus looks like a typical streptococcus, a medium-size elliptical or round bacterium usually linked with others in a chain, although the pneumococcus usually is linked only to one other bacterium—and is sometimes called a diplococcus—like two pearls side by side. When exposed to sunlight it dies within ninety minutes, but it survives in moist sputum in a dark room for ten days. It can be found occasionally on dust particles."

    —John M. Barry, The Great Influenza (NY: Penguin Books, 2004), 153

    February 14, 2009