Vaccination-induced neutralizing antibodies in immunocompetent hosts correlate with protection against rickettsiae
Abstract We previously demonstrated that a single-dose immunization with a live-attenuated Rickettsia parkeri mutant 3A2 confers complete protection against murine spotted fever rickettsioses. In this study, we investigated whether vaccination-elicited serum antibodies serve as immune correlates of...
Saved in:
| Main Authors: | , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-08-01
|
| Series: | npj Vaccines |
| Online Access: | https://doi.org/10.1038/s41541-025-01228-4 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Abstract We previously demonstrated that a single-dose immunization with a live-attenuated Rickettsia parkeri mutant 3A2 confers complete protection against murine spotted fever rickettsioses. In this study, we investigated whether vaccination-elicited serum antibodies serve as immune correlates of protection against rickettsiae. Immunization of immunocompetent C3H/HeN mice with 3A2 induced a robust and durable level of IgG antibody response, predominantly comprising IgG2a, IgG3, and IgG2b subclasses, and was associated with a significant expansion of CD19+ CD45R+ IgDlow plasma cells. Compared to mock controls, passive transfer of immune sera from 3A2-immunized mice protected C3H-SCID mice from R. parkeri challenge via multiple inoculation routes, including i.v., i.d. and i.d. plus tick saliva. Strikingly, serum antibodies of 3A2-immunized mice significantly reduced the number of R. parkeri plaques in vitro, indicating direct neutralizing activity. Collectively, our findings demonstrate that vaccination-induced serum IgG antibodies correlate with protection against rickettsial infection and possess direct neutralizing effects on rickettsiae. |
|---|---|
| ISSN: | 2059-0105 |