In the past years, a significant rise in the proportion of childhood complicated pneumonia cases related to pneumococcal serotypes 1 and 3 has been observed. PhtD is a vaccine candidate protein antigen. By using a pneumococcal lethal intranasal challenge mouse model, a significant additive effect on protection was observed with the combination of vaccination-induced anti-PhtD and injected anti-polysaccharide antibodies specific for serotypes 1 and 3.
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