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Back to Bacteria Index
Salmonella typhi
Salmonella is a genus of rod-shaped Gram-negative enterobacteria that
causes typhoid fever, paratyphoid and foodborne illness.
Disease-causing salmonellae have recently been re-classified into a
single species, Salmonella enterica, which has numerous strains or
serovars.
Salmonella typhi is a well know serovar that causes
typhoid fever. Other salmonellae are frequent causes of foodborne illness, and
can especially be caught from poultry. In the mid to late 20th
century, Salmonella enterica serovar Enteritidis was a common
contaminant of eggs. This is much less common now with the advent of
hygiene measures in egg production and the vaccination of laying hens
to prevent samonella colonisation. Many different salmonella serovars
also cause severe diseases in animals other than human beings.
Salmonella typhi is a type of Salmonella bacteria. It causes the
disease typhoid fever. The organism can be transmitted by the
fecal-oral route -- it is excreted by humans in feces and may be
transmitted by contaminated water, food, or by person to person
contact (with inadequate attention to personal hygiene). In the
developed world, Salmonella are readily removed/inactivated by
drinking water treatment and by wastewater treatment.
Cultural characteristics
They are facultative anaerobes that grow on simple media. On MacConkey
and DCA they produce pale non-lactose fermenting colonies.
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