Salmonella Flashcards
Salmonella cholerasuis was Isolated and described as the
hog cholera bacillus
Salmonella is a Gram ______?
Negative
Is Salmonella capsulated?
Non-capsulated
Salmonella has what type of flagella and fimbriae?
Peritrichous flagella with fimbriae.
What species of Salmonella is Non-flagellated.
S. gallinarum and S. pullorum
Is Salmonella aerobic or anaerobic?
Aerobic and facultative anaerobic.
Does Salmonella produce gas from glucose?
Yes
Is salmonella a lactose fermenter?
No
What are the selective media for Salmonella?
Tetrathionate and sodium selenite.
On which agar media can Salmonella grow?
BGA, MacConkey agar, bismuth sulfite agar.
What are the major antigens of Salmonella?
O, H, and Vi antigens.
The structure and composition of the polysaccharide in the cell wall.determines the specificity of what antigen?
O antigen?
Salmonella antigens change due to?
Lysogeny
loss of O antigen causes
loss of virulence
Smooth is more virulent that Rough
True
What antigen is made of protein and is heat-labile
H antigen, also known as the flagellar antigen.
What genes code for H antigen flagellin?
H1 and H2 genes.
H antigen phase variation is also known as
phase of Andrewes
H antigen exists as monophasic or diphasic, with only one form (FljB or FljC) expressed at a time is called?
phase of Andrewes
Which Salmonella species has the Vi antigen?
S. typhi
What sp. (causes typhoid in humans).
S. typhi
Name some typical Salmonella species.
S. cholerasuis, S. enteritidis, S. gallinarum, S. typhi, S. typhimurium.
Give an example of an atypical Salmonella.
S. salamae.
What is the main mode of Salmonella transmission?
Feco-oral route.
In poultry, what is a primary source of Salmonella infection?
Contaminated feed.
Which Salmonella species is universally distributed?
S. typhimurium.
Are young animals more susceptible to salmonellosis than older ones?
Yes.
What are the sources of Salmonella infection?
wild birds and rodents
At what temperature are most Salmonella killed?
56°C for 10-20 minutes
Which Salmonella species is heat-resistant?
S. senftenberg
salmonellosis starts as an infection where?
Enteric
How do prostaglandins contribute to Salmonella diarrhea
They activate adenylate cyclase
This causes secretion of water, carbonate, and chloride into the intestine.
adenylate cyclase
What is a significant diagnosis for salmonellosis
Neutrophils in feces
Which Salmonella species are most important in cattle?
S. dublin (host-adapted) and S. typhimurium (worldwide).
Which Salmonella species affect poultry?
S. pullorum and S. gallinarum.
What disease does S. pullorum cause?
Bacillary white diarrhea.
What disease does S. gallinarum cause?
Fowl typhoid.
Is S. pullorum highly fatal in young chicks?
Yes, especially in the first few days of life.
How is S. pullorum transmitted?
Transovarial (through eggs).
What species cause meningoencephalitis?
S. pullorum
S. gallinarum cross-react with?
S. pullorum
How is S. gallinarum transmitted vertically?
Through eggs (transovarial).
S. gallinarum be transmitted by ticks?
Argas persicus
What disease does S. typhimurium cause?
: Paratyphoid.
What condition does S. typhimurium cause in pigeons?
Megrims.
Salmonella is what type of parasite?
facultative intracellular parasite?
What type of immunity is involved in Salmonella infection?
Cell-mediated immunity.
S. gallinarum is flagellated. (True/False)
False.
The Vi antigen is found in all Salmonella species. (True/False)
False (only S. typhi).
