MIDTERM 04 - Spore-Forming Gram-Positive Bacilli Flashcards
A spore-forming aerobic, gram-positive bacilli with non swollen sporangium that occurs in chains
Bacillus sp.
2 groups of spore-forming, gram-positive bacilli
Bacilli, Clostridium
2 Bacillus species that are sources of antibiotics (SP)
Bacillus subtilis, Bacillus polymyxa
Antibiotic sourced from Bacillus subtilis
Bacitracin
Antibiotic sourced from Bacillus polymyxa
Polymyxin
Causes anthrax, which is primarily a disease of herbivores and is endemic in agrarian societies in developing countries (Bacillus species)
Bacillus anthracis
Binds to specific cell receptors (Bacillus anthracis toxins)
Protective antigen (PA)
An adenylate cyclase; with PA, forms edema toxin, which causes cell and tissue edema (Bacillus anthracis toxins)
Edema factor (EF)
With PA, forms lethal toxin, which is a major virulence factor and causes death in infected animals and humans (Bacillus anthracis toxins)
Lethal factor (LF)
Anthrax that involves entry of spores through the skin; is characterized by edema, lymphangitis, lymphadenopathy, fever, malaise and headaches (Clinical findings of Bacillus anthracis)
Cutaneous anthrax
Anthrax that involves entry of spores into the lungs; is characterized by hemorrhagic necrosis and edema of the mediastinum (Clinical findings of Bacillus anthracis)
Inhalational anthrax/Woolsorter’s disease
Anthrax that involves entry of spores through the mucous membranes; is characterized by abdominal pain, vomiting, and bloody diarrhea (Clinical findings of Bacillus anthracis)
Gastrointestinal anthrax
Anthrax that involves entry of spores through injections; is characterized by an extensive, painless, SC edema and an absence of the eschar of cutaneous anthrax (Clinical findings of Bacillus anthracis)
Injection anthrax
Treatment/drug of choice for Bacillus anthracis
Ciprofloxacin
Treatment of and prophylaxis against inhalational anthrax
Raxibacumab
Causes food poisoning; has an emetic type (due to emetic toxin) and diarrheal type (due to enterotoxins) (Bacillus species)
Bacillus cereus
Due to emetic toxin; associated with fried rice, milk, and pasta (Bacillus cereus food poisoning type)
Emetic type
Due to enterotoxins; associated with meat dishes and sauces (Bacillus cereus food poisoning type)
Diarrheal type
A large spore-forming, anaerobic, gram-positive, motile bacilli with swollen sporangium
Clostridium sp.
Clostridium botulinum (Location of spores in Clostridium sp.)
Subterminal
Clostridium tetani (Location of spores in Clostridium sp.)
Terminal
Clostridium perfringens (Location of spores in Clostridium sp.)
Central/Subterminal
Toxin produced by Clostridium botulinum that is absorbed from the gut, enters the blood circulation, and binds to the receptors of presynaptic membranes of motor neurons of the PNS and cranial nerves
Clostridium botulinum toxin
Clinical use for Clostridium botulinum toxin
Botox
Are proteins that allow the fusion of vesicles and plasma membrane
Snare proteins
2 types of snare proteins
v-SNARE, t-SNARE
Snare proteins found in the vesicles
v-SNARE
Snare proteins found in the target plasma membrane
t-SNARE
Characterized by flaccid paralysis, visual disturbances, inability to swallow, and speech difficulty (Clinical findings of Clostridium botulinum)
Botulism
Characterized by poor feeding, weakness, and signs of paralysis in babies (Clinical findings of Clostridium botulinum)
Floppy baby syndrome
Commonly found in soil, dust, and animal manure; involves the introduction of spores through wounds (Clostridium species)
Clostridium tetani
Toxin produced by Clostridium tetani; has 2 peptides linked by disulfide bond
Tetanospasmin
Characterized by spastic paralysis, trismus/lockjaw, risus sardonicus/sardonic smile, and opisthotonos/hyperarching of the back (Clinical findings of Clostridium tetani)
Tetanus
Tetanus that occurs due to the cutting of the umbilical cord with contaminated instruments (Clinical findings of Clostridium tetani)
Neonatal tetanus
3 toxins produced by Clostridium perfringens (ATE)
Alpha, Theta, Epsilon
A lecithinase that aggregates platelets, causing thrombus formation and poor perfusion of tissues (Clostridium perfringens toxins)
Alpha toxin
A hemolysin that produces target/double hemolysis on BAP (Clostridium perfringens toxins)
Theta toxin
Causes edema, hemorrhage (Clostridium perfringens toxins)
Epsilon toxin
3 enzymes produced by Clostridium perfringens (DHC)
DNAse, Hyaluronidase, Collagenase
Characterized by crepitation in the SC tissue and muscle, foul-smelling discharge, rapidly progressing necrosis, fever, hemolysis, toxemia, shock, and death (Clinical findings of Clostridium perfringens)
Gas gangrene/Clostridial myonecrosis
Part of the GI flora; causes pseudomembranous colitis (Clostridium species)
Clostridioides difficile
Characterized by pseudomembranes or microabscesses in patients who have diarrhea and have been given antibiotics (Clinical findings of Clostridiodes difficile)
Pseudomembranous colitis
Treatment/drug of choice for Clostridioides difficile
Vancomycin
Type of v-SNARE that binds Ca2+ that triggers the interaction of v-SNARE and t-SNARE proteins, resulting in fusion and exocytosis
Synaptotagmin