Thanks for choosing HCM for your query.
I appreciate your concern for your friend's health.Typhoid
is a bacterial infection caused by drinking contaminated water or food.
Provision of safe drinking water in most of the developing countries is a big challenge.
Ask your friend to drink safe drinking water preferably after boiling it and avoid eating improperly cooked vegetables and poultry.
There is a vaccine
available which is useful in prevention of typhoid in highly endemic areas.
The injectable Vi capsular polysaccharide vaccine (ViCPS vaccine) is given intramuscularly in a single dose.
Protection is induced about 7 days after the injection.
The protective efficacy 1.5 years after vaccination
is about 72%;
after 3 years it is about 50%.
To maintain protection, re vaccination is recommended every 3 years.
Hope your query is being answered.
A feedback is highly appreciated.