In Canada, a booster dose is recommended after 7 years.In Australia and Europe, an initial course of 3 doses on alternate days is recommended. Protection is achieved 7 days after the last dose. A booster dose is recommended every 3 years for people living in endemic areas, but every year for people traveling from non-endemic to endemic areas. Side effects
Side effects of this vaccine are mild and rare. Trade names
Vivotif (manufactured by PaxVax)

Research
Ty21a may also provide some degree of protection against paratyphoid fever A and B. This cross-protection by a typhoid vaccine is most likely due to O antigens shared between different S. enterica serotypes.A newer Vi-rEPA vaccine is being tested for preventing typhoid fever. It has a similar level of protection, but the protection may last longer with this newer vaccine. References
External links
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Therefore, the baby must be initially stabilized by correcting the dehydration and the abnormally high blood pH seen in combination with low chloride levels with IV fluids. This can usually be accomplished in about 24–48 hours.Intravenous and oral atropine may be used to treat pyloric stenosis. It has a success rate of 85-89% compared to nearly 100% for pyloromyotomy, however it requires prolonged hospitalization, skilled nursing and careful follow up during treatment. It might be an alternative to surgery in children who have contraindications for anesthesia or surgery, or in children whose parents do not want surgery. Surgery
The definitive treatment of pyloric stenosis is with surgical pyloromyotomy known as Ramstedts procedure (dividing the muscle of the pylorus to open up the gastric outlet). This surgery can be done through a single incision (usually 3–4 cm long) or laparoscopically (through several tiny incisions), depending on the surgeons experience and preference.Today, the laparoscopic technique has largely supplanted the traditional open repairs which involved either a tiny circular incision around the navel or the Ramstedt procedure. Compared to the older open techniques, the complication rate is equivalent, except for a markedly lower risk of wound infection. This is now considered the standard of care at the majority of childrens hospitals across the US, although some surgeons still perform the open technique. Following repair, the small 3mm incisions are hard to see. The vertical incision, pictured and listed above, is no longer usually required, though many incisions have been horizontal in the past years.