HIV infection causes a loss of immunity to smallpox, even in people who were vaccinated as kids and are taking antiretroviral drugs.
Concerns wereraised after a patient's death appears to defy accepted medical theory that survivors of Ebola virus infection are immune to reinfection.
High levels of neutralizing antibodies didn’t appear in patients’ blood until months after patients left the hospital. This information could be used to establish a benchmark of immune protection after vaccination.
The clinical outcomes associated with Zika virus (ZIKV) in the Americas have been well documented, but other aspects of the pandemic, such as attack rates and risk factors, are poorly understood.
Preexisting high antibody titers to dengue virus were associated with reduced risk of ZIKV infection and symptoms. The landscape of Zika virus immunity that now exists may affect the risk for future transmission.
Cross-immunity may be a factor contributing to the absence of a global pandemic as severe as the 1918 influenza pandemic in the century since.
Data demonstrated that a significant proportion of healthcare workers have the ability to neutralize Ebola virus (EBOV), despite never having developed Ebola virus disease symptoms, highlighting an important and poorly documented aspect of EBOV infection and progression.