These isolates were classified as Lancefield groups G (63%) and C (37%).
The superantigen speG gene was found to cluster in Lancefield groups C and G, belonging to clades A and B, respectively, and was present in a proportion of isolates similar to that described in other reports (18,22).
pyogenes, SDSE form large [beta]-hemolytic colonies on sheep blood agar with hyaluronic acid capsules but express Lancefield group C or G carbohydrate (15) and possess M protein, which is vital in inhibiting complement pathway activation and resisting phagocytic killing (16).
Beta-haemolytic streptococci species are further separated into Lancefield groups
(after Rebecca Lancefield, the American microbiologist who developed this classification system in the 1930s).
The use of Lancefield groups is diminishing, but they will be referred to in the literature and in clinical practice.
Lancefield group identification can be done using the capillary precipitation test, but other serologic methods can also be used.
and Their Features Species Lancefield Group Habitat Str.
Lancefield groups C and G comprise a variety of species; one of those species, Strepto coccus dysgalactiae subsp.
Lancefield groups C and G comprise a variety of distinct species; of these species, S.
Our data suggest that surveillance of invasive GAS disease in developing countries should also include surveillance of invasive GCS and GGS disease because the disease profile of these organisms is similar and because control strategies, including vaccines that can offer cross-protection between Lancefield groups
, may also be similar.
Cultures grew a [beta]-hemolytic streptococcus which did not group with Lancefield groups A, B, C, D, F, or G antisera and was positive for pyrrolidonylarylamidase, negative for bile-esculin, and failed to grow in 6.
A retrospective review of laboratory records showed that we had isolated [beta]hemolytic streptococci non-groupable with Lancefield groups A, B, C, D, F, or G antisera only five times in the last 2 years.