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a genus of gram-positive, facultatively aerobic cocci (family Streptococcaceae) occurring in pairs or chains. It is separable into the pyogenic group, the viridans group, the enterococcus group, and the lactic group. The first group includes the beta-hemolytic human and animal pathogens; the second and third include alpha-hemolytic parasitic forms occurring as normal flora in the upper respiratory tract and the intestinal tract, respectively; and the fourth is made up of saprophytic forms.
Streptococcus mu´tans a species implicated in dental caries.
Streptococcus pneumo´niae a small, slightly elongated, encapsulated coccus, one end of which is pointed or lance-shaped; the organisms commonly occur in pairs. This is the most common cause of lobar pneumonia, and it also causes serious forms of meningitis, septicemia, empyema, and peritonitis. There are some 80 serotypes distinguished by the polysaccharide hapten of the capsular substance. Called also pneumococcus.
Streptococcus pyo´genes a beta-hemolytic, toxigenic, pyogenic species that causes septic sore throat, scarlet fever, rheumatic fever, puerperal fever, acute glomerulonephritis, and other conditions in humans.


an organism of the genus Streptococcus. adj., adj streptococ´cal, streptococ´cic.
hemolytic streptococcus any streptococcus capable of hemolyzing erythrocytes, classified as α-hemolytic or viridans type, producing a zone of greenish discoloration much smaller than the clear zone produced by the β type about the colony on blood agar; and the β-hemolytic type, producing a clear zone of hemolysis immediately around the colony on blood agar. The β group contains the most virulent streptococci and is divided into serotype subgroups designated by letters (e.g., Group A).
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


A genus of nonmotile (with few exceptions), non-spore-forming, aerobic to facultatively anaerobic bacteria (family Lactobacillaceae) containing gram-positive, spheric or ovoid cells that occur in pairs or in short or long chains. Dextrorotatory lactic acid is the main product of carbohydrate fermentation. These organisms occur regularly in the mouth and intestines of humans and other animals, in dairy and other food products, and in fermenting plant juices. Some species are pathogenic. The type species is Streptococcus pyogenes.
[strepto- + G. kokkos, berry (coccus)]


, pl.


(strep'tō-kok'ŭs, -kok'sī),
A term used to refer to any member of the genus Streptococcus.
Farlex Partner Medical Dictionary © Farlex 2012


n. pl. strepto·cocci (-kŏk′sī, -kŏk′ī)
Any of various round gram-positive bacteria of the genus Streptococcus that occur in pairs or chains and can cause various infections in humans, including strep throat, erysipelas, and scarlet fever.

strep·to·coc·cal (-kŏk′əl), strep·to·coc·cic (-kŏk′sĭk, -kŏk′ĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


A genus of nonmotile, non-spore-forming, aerobic to facultatively anaerobic bacteria containing gram-positive, spheric, or ovoid cells that occur in pairs or short or long chains. These organisms occur regularly in the mouth and intestines of humans and other animals, in dairy products and other foods, and in fermenting plant juices. Some species are pathogenic.
[strepto- + G. kokkos, berry (coccus)]


, pl. streptococci (strep'tō-kok'ŭs,-sī)
A term used to refer to any member of the genus Streptococcus.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


Any of a range of spherical or ovoid bacteria of the genus Streptococcus that occur in chains or in pairs. See also STEPTOCOCCAL INFECTIONS.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


(pl. streptococci) 1 bacterial cocci that consist of chains of DIPLOCOCCI.

A genus of Gram-positive cocci (see GRAM'S STAIN such as Streptococcus mutans which can cause dental caries, Streptococcus pyogenes which can cause scarlet fever and streptococcal sore throat, and Streptococcus pneumoniae which can cause bacterial PNEUMONIA and was formerly called DIPLOCOCCUS PNEUMONIAE.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Streptococcus (plural, streptococci)

Any of several species of bacteria that are spherical in shape and form pairs or chains. Streptococci cause scarlet fever, tonsillitis, and pneumonia, and are often involved in lymphadenitis.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.


A genus of nonmotile non-spore-forming, aerobic to facultatively anaerobic bacteria containing gram-positive, spheric or ovoid cells that occur regularly in mouth and intestines of humans and in dairy and other food products, and in fermenting plant juices.
[strepto- + G. kokkos, berry (coccus)]
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about Streptococcus

Q. What Is Streptococcal Pneumonia? I have heard that I might have streptococcal pneumonia. What exactly does that mean?

A. Streptococcal pneumonia is a disease caused by the streptoccus bacteria. It is one of the most common causes of pneumonia in healthy people. You can learn more about bacterial pneumonia here-

Q. My friend think she has strep in her throat. What should she do. She doesn't want to take antibiotics. Her glands are swollen and she feels kinda out of it. Any more information or links would be greatly appreciated.

A. she should go to a Dr. that will take a look and a swab of the area. if he'll suspect a Strep. he'll give her antibiotics before getting results. it's important to follow antibiotic instructions ("10 days, 3 times a day"..).those infection can progress to other organs like the heart valves (very common) and cause chronic heart failure.

Q. 5 year old son diagnosed with streptococcus must I give him antibiotics? He is 5 years old and never received antibiotics before. He feels good and does not complain of any problem. The doctor said he should take antibiotics for 10 days. Is it mandatory?

A. Thanks a lot for your help, I will follow your advice.

More discussions about Streptococcus
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References in periodicals archive ?
Spellerberg, "Human infections due to Streptococcus dysgalactiae Subspedes equisimilis" Clinical Infectious Diseases, vol.
Tuohinen, "Two cases of cardiac device-related endocarditis due to Streptococcus dysgalactiae subsp.
Complete genome sequencing and analysis of a Lancefield group G Streptococcus dysgalactiae subsp.
The studies cited in the meta-analysis evaluated SCC from mammary quarters infected by Streptococcus uberis and Streptococcus dysgalactiae. Although the present study did not identify S.
Prevalence of emm types and antimicrobial susceptibility of Streptococcus dysgalactiae subsp.
isolated in North America and Europe including the first report of fluoroquinolone-resistant Streptococcus dysgalactiae subspecies equisimilis: report from the SENTRY Antimicrobial Surveillance Program (1997-2004)," Diagnostic Microbiology and Infectious Disease, vol.
313 7,37% Streptococcus uberis 277 6,52% Streptococcus agalactiae 222 5,23% Streptococcus bovis 209 4,92% Streptococcus dysgalactiae 203 4,78% Escherichia coli 203 4,78% Streptococcus sp 184 4,33% Leveduras sp.
(35,7%), SCP (1,6%), Escherichia coli (1,6%) y Streptococcus dysgalactiae (0,5%) [14].
A case of streptococcal toxic shock syndrome due to Group G streptococci identified as Streptococcus dysgalactiae subsp.
Conversely, the lowest contamination was noticed with Staphylococcus saprophyticus subsp bovis (2%), Streptococcus saprophyticus III (2%), Streptococcus dysgalactiae subsp equimitus (2%), Streptococcus cremoris (2%), Streptococcus group O (2%), Streptococcus saprophyticus I (2%), Streptococcus faecalis var malodortus (2%) and Micrococus luteus II (2%) followed by Streptococcus milleri (4%), Streptococcus faecium (4%), Staphylococcus epidermidis (4%), Staphylococcus capitis subsp capitis (4%), Kluyera ascorbata (4%), Lactobacillus bulgaricus (6%), Streptococcus lactis (6%) and
Material e Metodos: Para a contaminacao experimental do leite foram utilizadas cepas de Staphylococcus aureus (ATCC 29213), Streptococcus uberis (ATCC 20569), Streptococcus agalactiae (ATCC 13813), Streptococcus dysgalactiae (ATCC 20662) e Escherichia coli (ATCC 25922).
Streptococcus dysgalactiae subspecies equisimilis O(SDSE) belongs to the pyogenic group of streptococci first designated by Vandamme et al.

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