Typhi lives only in humans;
Typhi experts worry that the outbreak could soon
spill into other countries.
Typhi enters through the mouth and spends 1-3 weeks in the intestine.
Typhi enters through the mouth and spends
1 to 3 weeks in the intestine.
Typhi enters through the mouth
and spends 1 to 3 weeks in the intestine.
Bacteria and
protozoans that are amenable to treatment include Shigella Salmonella Typhi, and Giardia species.
Spread through contaminated water and food, S. Typhi causes up to 22 million cases of typhoid fever a year.
It is caused by a bacterium called Salmonella Typhi, which is related to the bacteria that cause salmonella food poisoning.
Your immune system can not fight Salmonella Typhi because this bacteria can be safe in your cells
without affecting your immune system.
The immune system of the host can
do little to fight back because S. Typhi can live within the host's cells, safe from the immune system.
As the Ty21a vaccine contains a live sample of Salmonella Typhi bacteria, it is not suitable for people
who have a weakened immune system(the body's natural defence against infection and illness), such as people with HIV.