Although the incidence of plague has gradually been reduced to lower levels, there has been an increasing trend in plague incidence in the 21st century, leading the World Health Organization (WHO) to classify it as a re-emerging infectious disease ( 14 ).
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Delivery of <i>Yersinia pestis</i> antigens via <i>Escherichia coli</i> outer membrane vesicles offered improved protection against plague.
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