Objective To establish a mouse model of infection with the minimum lethal dose of
Vibrio vulnificus
(
V. vulnificus
) and to evaluate the protective efficacy of inactivated whole-cell (IWC) vaccine using this model. Methods A mouse model of lethal-dose infection was established by intraperitoneal injection of different doses of
V. vulnificus
. Bacterial colonization in the organs was detected with tissue homogenate plating
and pathological changes in the organs were observed after tissue section
staining. Flow cytometry was used to detect immune cell responses after liver tissues were digested into single-cell suspension. IWC vaccine of
V. vulnificus
was prepared
and the mice were immunized through different routes to observe the protective efficacy of the vaccine. Results A mouse model of infection with the minimum lethal dose at 1×10
6
CFU of
V. vulnificus
was successfully established. After infection
the bacteria were
mainly colonized in the liver of mice and caused severe pathological damages. Compared with the uninfected mice
the proportion of neutrophils in the liver was significantly increased in the infected mice
whereas the proportions of B cells and T cells were correspondingly decreased (
P<
0.05). A single intramuscular or intraperitoneal injection of the IWC vaccine could protect the mice effectively against lethal infection of
V. vulnificus
in 7 d later (
P<
0.01)
although the level of serum IgG having no significant increase. Conclusion A mouse model of lethal-dose infection with
V. vulnificus
is successfully established
with histopathological characteristics. The IWC vaccine of
V. vulnificus
rapidly mediates immune protection in this model probably independent of IgG.
关键词
Keywords
references
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