Streptococcus all are true except :
Correct Answer: Pyrogenic toxin A is plasmid mediated
Description: Pyrogenic exotoxin Most strains of streptococcus pyogenes produce one or more toxins that are called pyrogenic exotoxins because of their ability to induce fever. Three types of streptococcal pyrogenic exotoxins have been identified, i.e. A, B, and C. - "The genes of SPE "A" and SPE 'C' are transmitted between the strains of streptococcus by bacteriophagedeg and stable production depends on lysogenic conversion". - "The genes for SPE B are coded by chromosomesQ".(not plasmids) SPE A and SPE C' are also called erythrogenic toxins as they are responsible .for rash observed in patients with scarlatina. - They have superantigen activity which causes massive release of inflammatory gtokines from T lymphocytes causing fever, shock and tissue damage. Pyrogenic exotoxin A Gene transmitted by /3 phase Pyrogenic extoxin B Gene transmitted by chromosome Pyrogenic exotoxin C Gene transmitted by fi phase
Category:
Microbiology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now