Typhoid fever is common in Pakistan. There are two vaccines to prevent typhoid. One is an inactivated (killed) vaccine gotten as a shot, and the other is live, attenuated (weakened) vaccine which is taken orally (by mouth). The vaccine given as a shot is the one that is used commonly in Pakistan. The earliest that this vaccine can be given is at two years of age. While a single dose is protective, the protection only lasts around two years, after which time the vaccine dose may need to be repeated.
Side effects of the vaccine include mild reactions like fever, headache and redness at the site of injection, and even these reactions are quite rare.