If your going to certain countries, Kenya, India, etc. I would suggest that you arrange to see your doctor/practice nurse/holiday clinic for them to tell you what you need to have done to protect you while you are away. Sometimes this can differ for even people on the same tour. Age and general health can make things differ, so just because one person has some thing it does not mean the same for you.
ALWAYS SEEK YOUR OWN SURGERYS OPINION.
Kenya Safari I had to have a few jabs at not cost to me but I did have to pay for the Yellow Fever jab and certificate paperwork, and a prescription for Malerone (malaria Tabs) that I then got of the internet. Much cheaper than the chemists.
I hate jabs but I work on the ....better to be safe than sorry.
Happy Holidays
Cindy