• Product name
    Anti-Streptococcus group A antibody
    See all Streptococcus group A primary antibodies
  • Description
    Rabbit polyclonal to Streptococcus group A
  • Host species
  • Specificity
    Type specific carbohydrate of group A Streptococcus.
  • Tested applications
    Suitable for: ICC/IF, ELISAmore details
  • Species reactivity
    Reacts with: Other species
  • Immunogen

    Streptococci, group A.


  • Form
  • Storage instructions
    Shipped at 4°C. Upon delivery aliquot and store at -20°C. Avoid freeze / thaw cycles.
  • Storage buffer
    pH: 7.20
    Preservative: 0.1% Sodium azide
    Constituent: 0.0268% PBS
  • Concentration information loading...
  • Purity
    Protein A purified
  • Purification notes
    Affinity chromatography.
  • Clonality
  • Isotype
  • Research areas


Our Abpromise guarantee covers the use of ab21034 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
ICC/IF Use at an assay dependent dilution.
ELISA Use at an assay dependent dilution.


  • Relevance
    The genus Streptococcus is comprised of a wide variety of both pathogenic and commensal gram positive bacteria which are found to inhabit a wide range of hosts, including humans, horses, pigs and cows. Within the host, streptococci are often found to colonize the mucosal surfaces of the mouth, nose and pharynx. Streptococci can be divided into many groups on the basis of antigenic differences in group-specific polysaccharides located in the bacterial cell wall. More than 20 serologic groups have been identified and designated by letters, eg, A, B, C. Group A streptococci, cause a wide-range of disease in humans, from mild sore throats to life-threatening invasive disease such as necrotising fasciitis. Streptococcus pyogenes (a group A Streptococcus) is one of the most important pathogens encountered in clinical practice. Group A streptococci (GAS) are gram-positive, nonmotile, non-spore-forming organisms that appear as pairs or short-to-moderate-sized chains. Group A organisms can be identified by enzyme immunoassays.
  • Alternative names
    • Group A strep antibody
    • Group A streptococci antibody
    • Group A streptococcus antibody


This product has been referenced in:
  • Maudsdotter L  et al. Lactobacilli reduce cell cytotoxicity caused by Streptococcus pyogenes by producing lactic acid that degrades the toxic component lipoteichoic acid. Antimicrob Agents Chemother 55:1622-8 (2011). Read more (PubMed: 21245448) »
See 1 Publication for this product

Customer reviews and Q&As

1-4 of 4 Abreviews or Q&A


Thank you for your recent telephone enquiry.

I am sorry it has taken some time ot obtain the required information for you as I had quite a few people to contact to gather the details.

I obtained information on the following Strep group A antibodies that have been tested in western blot. As discussed on the telephone, I am sorry to confirm that these will not have been tested in vivo.

ab20509 Positive for Group A (ATCC 10403), Negative for Group B, Group C, Group D, Group F, Group G, S. aureus, Treponema reiter, Neisseria perf., Streptococcus pneumonia mix (8 strains), Bacillus cereus and human cells.
https://www.abcam.com/index.html?datasheet=20509 (or use the following: https://www.abcam.com/index.html?datasheet=20509).

ab20752 Positive for Group A (ATCC 10403), Negative for Group B, Group C, Group D, Group F, Group G, S. aureus, Treponema reiter, Neisseria perf., Streptococcus pneumonia mix (8 strains), Bacillus cereus and human cells.
https://www.abcam.com/index.html?datasheet=20752 (or use the following: https://www.abcam.com/index.html?datasheet=20752).

ab20915 Positive for Streptococcus pyogenes (ATCC 12344, UV-inactivated), Negative for Group B: Type 1a (ATCC 12400), Type 1b (ATCC 12401), Type 1c (ATCC 27591), Type II (ATCC 12973) and Type III (ATCC 12403); Group C = ATCC 12960; Group D = ATCC 12389; Group E = ATCC 12390, Group F = ATCC 12393 & Group G = ATCC 27961.
https://www.abcam.com/index.html?datasheet=20915 (or use the following: https://www.abcam.com/index.html?datasheet=20915).

ab21034 Positive for Group A (ATCC 10403), Negative for Group B, Group C, Group D, Group F, Group G, S. aureus, Treponema reiter, Neisseria perf., Streptococcus pneumonia mix (8 strains), Bacillus cereus and human cells.
https://www.abcam.com/index.html?datasheet=21034 (or use the following: https://www.abcam.com/index.html?datasheet=21034).

ab21046 Positive for Group A (ATCC 10403), Negative for Group B, Group C, Group D, Group F, Group G, S. aureus, Treponema reiter, Neisseria perf., Streptococcus pneumonia mix (8 strains), Bacillus cereus and human cells.
https://www.abcam.com/index.html?datasheet=21046 (or use the following: https://www.abcam.com/index.html?datasheet=21046).

ab25870 Specific for Group A carbohydrate.
https://www.abcam.com/index.html?datasheet=25870 (or use the following: https://www.abcam.com/index.html?datasheet=25870).

ab36303 Anti-Streptococcus group A antibody [5A1]
https://www.abcam.com/index.html?datasheet=36303 (or use the following: https://www.abcam.com/index.html?datasheet=36303).
This antibody was tested and found positive against the following:
a. Group A Streptococcus = Streptococcus pyogenes, ATCC #12344

2. The antibody was tested and found negative against the following:

a. Group B Streptococcus = Type Ia (ATCC # 12400), Type Ib (ATCC # 12401), Type Ic (ATCC #27591), Type II (ATCC # 12973), and Type III (ATCC# 12403)

b. Group C Streptococcus = ATCC # 12960

c. Group D Streptococcus = ATCC #12389

d. Group E Streptococcus = ATCC # 12390

e. Group F Streptococcus = ATCC #12393

f. Group G Streptococcus = ATCC #27961

ab68879 ab68880 ab68881 have been specifically tested for reactivity against the ATCC 10403 strain of Group A Streptococcus. It was also tested and found to be negative against Treponema ryder, S. pneumoniae, and Streptococcus Group B, C, D, F, and G.
https://www.abcam.com/index.html?datasheet=68879 (or use the following: https://www.abcam.com/index.html?datasheet=68879).
https://www.abcam.com/index.html?datasheet=68880 (or use the following: https://www.abcam.com/index.html?datasheet=68880).
https://www.abcam.com/index.html?datasheet=68881 (or use the following: https://www.abcam.com/index.html?datasheet=68881).

I hope this information will be helpful. If you have any further questions, please do not hesitate to contact me.

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Following up my message from yesterday, our source for this antibody confirmed that the carbohydrate that is referred to in the specificity field of the datasheet is "type specific" insofar as it is unique to group A. However, the carbohydrate/polysaccharide, a component of the cell wall, is not further characterized. I hope this helps. If you have any other questions, please contact us.

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I have asked the laboratory to clarify, if possible, but I think the specificity text on the datasheet, "Type specific carbohydrate of group A Streptococcus", simply means that the antibody is reactive with an uncharacterized carbohydrate on Streptococcus group A, but is not reactive with carbohydrates isolated from other bacteria. I expect the lab will confirm that this is the case, that the carbohydrate is not further characterized or identified, but I will forward their reply when I receive it.

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The reply I received from the laboratory that produces the anti-Streptococcus group A antibody ab21034 replied to your question as follows: "Group A Streptococcus contains both group as well as type specific carbohydrate antigens in the cell wall. Our antibodies are directed to the group A carbohydrate antigen and thus will not miss any group A isolates. To do this, we used a strain that does not contain any type specific antigen and purified the group antigen from this strain. The resulting antibod(ies), once produced, are then tested to confirm that they only react with group A strep and not with any of the other strep groups." I may be able to obtain the details of the isolation of the antigen used for immunization, for instance the strain it was isolated from, but immunogen details are often considered proprietary information. Has this reply answered your question? If not, can you tell me what it is you are trying to identify? Our source may be able to tell us if the antibody is capable of identifying it.

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