Gram -positive bacilli, Anaerobic, Spore forming, Catalase-negative Flashcards
The toxins produced by the species are acquired through ingestion or open wounds that have
been contaminated with soil
Clostridium
Clostridium are motile with peritrichous flagella except for
C. perfringens, C. ramosum, and C.
innocuum
clostridium have swollen sporangia except for
C. perfringens
They are non-encapsulated except for
C. perfringens
They are carbohydrate fermenters except for
C. tatami and C.histolyticum
It is the most commonly isolated member of Clostridum in blood culture
Clostridum perfringens(Gas gangrene bacillus)
“Boxcar-shaped” bacilli with oral, subterminal spores
Clostridum perfringens(Gas gangrene bacillus)
Virulence factor of C. perfringens
Clostridum perfringens(Gas gangrene bacillus)
litmus milk-Colonies exhibit a stormy fermentation of milk
Clostridum perfringens(Gas gangrene bacillus)
(+) Reverse CAMP test-formation of an “arrowhead-shaped” zone of hemolysis
towards the test organism
Clostridum perfringens(Gas gangrene bacillus)
It is a life-threathening destruction of muscle and other tissues
It is accompanied by bullae, pain, swelling, serous discharge, discoloration and tissue
necrosis
Gas gangrene-Clostridum perfringens(Gas gangrene bacillus)
It is caused by the ingestion of Beta-enterotoxin in contaminated food
Improperly stored food allows the germination of the spores and growth of vegetative
bacteria
Symptoms: Bloody diarrhea and abdominal pain
Clostridial necrotizng enteritis or enteritis necroticans
It is a soil and environmental inhabitant
The endospores are found in the soil, dust, and feces of many farm animals
Clostridium tetani (Tack head bacillus)
Virulence factor of Clostridium tetani
Tetanospasmin (neurotoxin)
Microscopy: cells are with terminal spores and swollen sporangis that have a “drumstick” or
“tennis racket” appearance
Clostridium tetani (Tack head bacillus)
Biochemical test: (+) gelatinase, and indole; (-) lecithinase and lipase
Clostridium tetani (Tack head bacillus)
It is an endopeptidase that selectively cleaves the synaptic vesicle membrane protein,
synaptobrevin
It causes tension or cramping and twisting in skeletal muscles that surround the wound, and
tightness of the jaw muscle
Tetanospasmin
It is characterized by trismus or lock jaw and risus sardonicus or distorted grin
Tetanus
It occurs when the organism enters an open wound and spreads a potent toxin that mediates
generalized muscle spasm
Tetanus
Symptom: Muscular rigidity, difficulty in swallowing, rigidity of the abdomen, chest, back, and
limbs
Incubation period: 3 to 21 days
Tetanus
is contracted through the use of contaminated instruments on newborns
Tetanus neonatorum
It is found in soil and aquatic sediments
It is a potential bioterrorism agent
It is characterized by the presence of subterminal spores
Clostridium botulinum (―Canned food‖ bacillus)
Canned food bacillus
Clostridium botulinum (―Canned food‖ bacillus)
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