Salmonella Vaccine Clinical Trial Results – New Hope

Researchers at the University of⁣ Maryland School of Medicine’s Center for Vaccine Development adn Global Health have completed a successful Phase 1 clinical trial⁢ of a new ‍vaccine targeting both typhoid fever and non-typhoidal Salmonella infections,which are responsible for important illness and death ⁣globally.

The investigational Trivalent⁢ Salmonella Conjugate Vaccine (TSCV)⁢ is designed using sugar molecules taken from Salmonella Typhi‍ bacteria,which causes typhoid fever,and also from⁣ two common serotypes of invasive non-typhoidal Salmonella enterica which are among the leading causes of foodborne illness. The sugar molecules are linked to proteins that enhance the body’s immune recognition.

Importantly for food ⁣safety and domestic public health, the S. enterica serotypes targeted by TSCV ‍are frequently implicated in U.S. outbreaks linked to contaminated poultry, eggs, and produce.The⁣ U.S. Centers⁢ for Disease Control and Prevention (CDC) estimates ⁣that Salmonella causes⁢ 1.35 million infections and more than⁣ 26,000 hospitalizations annually in the country.

Regarding global public health, a single vaccine that protects against both typhoid fever and S. enterica infection could be⁢ particularly beneficial for children in sub-Saharan ⁣Africa. In 2017 alone, sub-Saharan ‍Africa saw over 420,000 cases of salmonellosis and 66,000 deaths, primarily among children. Typhoid fever caused an ⁣additional 650,000⁢ cases and nearly 9,000 deaths ⁣in the region.

In the randomized, placebo-controlled trial,⁢ 22 healthy adults either received ⁤a low (6.25 microgram) or high (12.5 microgram)⁣ dose of TSCV, or a placebo.The ‍vaccine‍ was well-tolerated, with only mild injection site discomfort reported. All vaccinated participants developed strong immune responses to the⁣ three targeted Salmonella strains,⁤ while placebo recipients did not.

Some ⁣trial participants showed pre-existing Salmonella antibodies, suggesting prior exposure through ⁤foodborne sources, which may enhance vaccine-induced immunity.

The vaccine also activated⁣ a robust immune response involving white blood cells that help clear infections-an effect not previously observed with one of the vaccine’s protein components.

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