Groups are determined by PRECIPITIN test, serologic test to measure a specific reaction between antigen (C carbohydrate, located in the cell wall) and antibody which results in a visible precipitate. Group A Streptococci (Streptococcus pyogenes) is among the most important human pathogens.
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Some of the known causes of polyhydramnios include: 1  A birth defect that affects the baby's gastrointestinal tract or central nervous system. 2  Maternal diabetes. 3  Twin-twin transfusion â a possible complication of identical twin pregnancies in which one twin receives too much blood and the other too little.