MDS entrance preparations | Streptococci Facts

Regarding streptococci false is 

a. Streptococcus pyogens or group A streptococci is responsible for pharyngitis and post infections syndromes like acute rheumatic fever and poststreptococcal glomerulonephriatis
b. Group A streptococci are among few bacterial pathogen that produce signs of infection and surrounding cellulitis within first 24 hr of surgery 
c. Necrotising fasciitis of bowel is usually polymicrobial involving anaerobic bacteria and ram negative bacilli
d. UTI’s are quite commonly associated with group B streptococcus

Ans . D

Streptococci are gram positive cocci in short chains, long and some in pairs (diplococcic). Classification is based on carbohydrate protein Lancefield  grouping.

Gp. A (pyogens), pharngitis, erysipelaspost streptococcal  sequelae(AGN, Rhemmatic fever) impetigo, wound infection in 24 hrs with lymphangitis

GB (agalactiae) early and late onset meniggitis acquired from a infected / colonized birth canal.

gpD (enterococcal or non enterococcal) enterococcal (faecalis, faecium) causes UTI wound infection and endocarditis, non enterococcal group(bovis)

Causes endocarditis

Viridans streptococci (mutans, sanguis, milleri) causes dental caries, infective endocardits and visceral abcess , brain abcess Bacterial endocarditis is commonly associated with splenoctomy  commonly due to streptococcus, followed by staphylococcus then  gram negative bacilh like salmonella and about 5% due to anaerobic organism.