They found that the pathogens Streptococcus pyogenes and Moraxella catarrhalis colonize overlapping regions of the human nasopharynx, and that M. catarrhalis can dramatically increase the adherence of S. pyogenes to human epithelial cells (Infect. Immun. 2004;72:6689–93). Streptococcus pyogenes is a species of Gram-positive bacterium in the genus Streptococcus. These bacteria are aerotolerant and an extracellular bacterium, made up of non-motile and non-sporing cocci. Group A Streptococcus (GAS) is one of the major causes of respiratory tract infections. The objectives of this study were to identify isolates of S. pyogenes obtained from respiratory tract infections, and to assess their susceptibility to several antibiotics. Detailed Amoxicillin dosage information for adults and children. Includes dosages for Urinary Tract Infection, Sinusitis, Bronchitis and more; plus renal, liver and dialysis adjustments. Abstract. The response of Streptococcus pyogenes to amoxicillin or amoxicillin-clavulanic acid (Augmentin; Beecham Group) therapy of a mixed streptococcal-staphylococcal infection was studied in a surgical wound in mice. Streptococcus pyogenes, which are also called group A Streptococcus or group A strep, cause acute pharyngitis known as strep throat. Etiology Group A strep pharyngitis is an infection of the oropharynx caused by S. pyogenes. Streptococcus pyogenes, which is also called group A Streptococcus or group A strep, cause scarlet fever. Etiology. Scarlet fever is an illness caused by pyrogenic exotoxin-producing S. pyogenes. A group A streptococcal infection is an infection with group A streptococcus (GAS). Streptococcus pyogenes comprises the vast majority of the Lancefield group A streptococci, and is often used as a synonym for GAS. Re: Antibiotic for streptococcus pyogenes in c. I, along with others have taken a z-pack successfully without recurrence.I take probiotics every day, if I dont i will get the D.