What is the Quellung reaction quizlet?
What is the Quellung reaction? – the quellung reaction results from specific antibody interaction with the polysaccharide capsule, causing capsular swelling and differences in light refraction visible by microscopy.
What is the most common disease caused by Propionibacterium group of answer choices?
Affiliations. Propionibacterium acnes is a gram-positive human skin commensal that prefers anaerobic growth conditions and is involved in the pathogenesis of acne (Kirschbaum and Kligman, 1963). Acne is one of the most common skin diseases, affecting more than 45 million individuals in the United States.
How does the toxin Clostridium tetani produce its action?
tetani spores that germinate and produce toxin. The infection remains localized, often with only minimal inflammatory damage. The toxin is produced during cell growth, sporulation and lysis. It migrates along neural paths from a local wound to sites of action in the central nervous system.
What bacteria produces one of the most deadly bacterial toxins known?
Key facts. Clostridium botulinum is a bacterium that produces dangerous toxins (botulinum toxins) under low-oxygen conditions. Botulinum toxins are one of the most lethal substances known.
What is Quellung test used for?
The quellung reaction has been used to identify the 93 known capsular serotypes of Streptococcus pneumoniae in diagnostic settings, but in recent years it has been challenged by the latex agglutination method, and further by molecular typing techniques such as the polymerase chain reaction, which detect DNA and …
What does Propionibacterium cause?
Although primarily recognized for its role in acne, P. acnes is an opportunistic pathogen, causing a range of postoperative and device-related infections. These include infections of the bones and joints, mouth, eye and brain.
Where is Propionibacterium found?
Propionibacterium acnes is a facultative anaerobic Gram-positive bacterium present on human skin as part of the normal flora, as well as in the oral cavity, large intestine, conjunctiva, and external ear canal (1).
Which test is performed in order to confirm an infection with Clostridium botulinum?
To confirm the presence of botulinum toxin in the culture neutralization tests using specific antisera for each type of botulinum toxin (neutralization test) can be performed, or detection for the presence of Clostridium botulinum genes and its type in the culture medium (molecular detection by PCR).
What are the identifying characteristics of Clostridium tetani?
Clostridium tetani tetani bacterium is a spore-forming, gram-positive, slender, anaerobic rod. The organism is sensitive to heat and cannot survive in the presence of oxygen. The spores, in contrast, are extremely resistant to heat and the usual antiseptics.
Which of the following bacterial genera produce S endospores?
Endospores are dormant alternate life forms produced by the genus Bacillus, the genus Clostridium, and a number other genera of bacteria, including Desulfotomaculum, Sporosarcina, Sporolactobacillus, Oscillospira, and Thermoactinomyces.