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Typhim Vi., Typhoid Vi Polysaccharide Vaccine, produced by Sanofi Pasteur SA, for intramuscularuse, is a sterile solution containing the cell surface Vi polysaccharide extracted from Salmonella enterica serovar Typhi, S typhi Ty2 strain. The organism is grown in a semisynthetic medium.Casein derived raw materials are used early in manufacturing during the fermentation process. The capsular polysaccharide is precipitated from the concentrated culture supernatant by the addition of hexadecyltrimethylammonium bromide, and the product is purified by differential centrifugation and precipitation. Each 0.5 mL dose may contain residual amounts of formaldehyde(not more than 100 mcg) used for the inactivation of the bacterial culture. The potency of the purified polysaccharide is assessed by molecular size and O-acetyl content.

Tresivac Vaccine is well accepted by the body in most cases. Some children may be allergic to Tresivac Vaccine and thus cannot take it. The vaccine is generally administered to children aged 1 year and above. A couple of doses of Tresivac Vaccine are generally administered in the span of a few years.

The Polio Vaccine is recommended in a 4-dose series in children at ages 2 months, 4 months, 6-18 months, and 4 through 6 years. The final dose in the series should be administered on or after the fourth birthday and at least 6 months after the previous dose.