Vactyph Vaccine is a medicine used to prevent typhoid fever in adults and children aged two and above. The vaccine works by causing the body to produce its own protection (antibodies) against this disease. Typhoid fever is caused by a bacteria called Salmonella Typhi. Vactyph Vaccine is administered by a healthcare professional and should not be self-administered. It is generally given at least 2 weeks prior to expected exposure with typhoid fever. A single dose is usually given every 3 years to those people who remain at risk of typhoid fever. Your doctor may also advise on the possible need for future booster dosing. Some common side effects of this medicine include injection site reactions (such as pain, swelling, redness), headache, nausea, tiredness and fever. If these side effects do not go away with time or get worse, let the doctor know. The doctor may help with ways to reduce or prevent these symptoms. To make sure the vaccine is safe, before receiving the vaccine, it is important to let the doctor know if you have any other illnesses. You should also tell the doctor about all the medicines you are taking. Pregnant and breastfeeding mothers should consult and seek advice from their doctor before receiving the vaccine.