Effects of T Cell Chemo-Vaccination after SHIV Exposures and PrEP
Author Information
Author(s): Kersh Ellen N., Adams Debra R., Youngpairoj Ae S., Luo Wei, Zheng Qi, Cong Mian-er, Aung Wutyi, Mitchell James, Otten Ron, Hendry R. Michael, Heneine Walid, McNicholl Janet, Garcia-Lerma J. Gerardo
Primary Institution: Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, United States of America
Hypothesis
Can pre-exposure prophylaxis (PrEP) induce adaptive immune responses in the absence of productive infection?
Conclusion
The study found that PrEP can induce T cell responses in some macaques, but these responses may not provide protection against subsequent infections.
Supporting Evidence
- PrEP protected 4 out of 6 macaques from infection.
- Two of the four PrEP-protected macaques developed T cell responses.
- Control macaques showed no anti-SHIV immune responses before infection.
- Chemo-vaccination-induced T cell responses were robust but short-lived.
- One macaque remained uninfected after additional PrEP and virus exposure.
- Chemo-vaccination responses were characterized by a focus on pol epitopes.
Takeaway
Researchers wanted to see if giving medicine before exposure to a virus could help the body fight it off later. They found that it sometimes worked, but not always.
Methodology
Nine rhesus macaques were monitored for immune responses after receiving up to 14 weekly low-dose SHIV exposures, with some receiving PrEP.
Potential Biases
Potential bias due to the small number of macaques and the specific genetic backgrounds of the animals used.
Limitations
The small sample size and the variability in immune responses among individual macaques limit the generalizability of the findings.
Participant Demographics
Nine adult male Indian rhesus macaques.
Statistical Information
P-Value
0.003
Statistical Significance
p=0.003
Digital Object Identifier (DOI)
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