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Cross-reactivity

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Vaccinations

Vaccinations

Immunological Memory

Immunological Memory

Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature is...

Immune Response Against Viral Pathogens

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...

Poliomyelitis

Poliomyelitis

Poliomyelitis is caused by poliovirus, a small, non-enveloped, positive-sense RNA virus of the Picornaviridae family and Enterovirus genus. Transmission occurs primarily via the fecal-oral route, often through ingestion of contaminated water or food. The virus initially replicates in the oropharynx and intestinal mucosa, particularly in lymphoid tissues such as the tonsils, Peyer’s patches, and regional lymph nodes. Primary viremia follows, allowing dissemination throughout the body.In most...

Vaccines

Vaccines

Vaccines are among the most effective tools in preventive medicine, designed to prepare the immune system to recognize and combat infectious agents. By introducing antigens—substances that the immune system identifies as foreign—vaccines stimulate an adaptive immune response that leads to immunological memory. This immunological memory enables the body to mount a faster and more effective response upon future exposures to the actual pathogen.Vaccines can be categorized based on the type of...

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Immune interference after sequential alphavirus vaccine vaccinations.

Phillip R Pittman¹, Ching-Tong Liu, Timothy L Cannon

¹US Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702-5011, United States. phillip.pittman@amedd.army.mil

|July 7, 2009

Summary

Vaccine order matters for alphavirus protection. Receiving Venezuelan equine encephalitis (VEE) vaccine before eastern and western equine encephalitis (EEE and WEE) vaccines improved antibody response rates. Gender also impacted outcomes.

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Area of Science:

* Virology and Immunology
* Vaccinology
* Public Health

Background:

* Alphavirus infections pose significant public health threats.
* Development of effective vaccines against alphaviruses like Venezuelan equine encephalitis (VEE), eastern equine encephalitis (EEE), and western equine encephalitis (WEE) is crucial.
* Understanding the impact of vaccine administration order is essential for optimizing immune responses.

Purpose of the Study:

* To compare the effect of administration sequence of investigational alphavirus vaccines on neutralizing antibody responses.
* To investigate potential gender-specific differences in vaccine response.
* To inform future vaccine strategies for alphavirus threats.

Main Methods:

* Volunteers received either inactivated eastern and western equine encephalitis (EEE and WEE) vaccines followed by live attenuated Venezuelan equine encephalitis (VEE) vaccine, or vice versa.
* Neutralizing antibody responses were measured.
* Statistical analyses, including odds ratios, were used to assess response rates and gender effects.

Main Results:

* Vaccine administration order significantly influenced antibody response rates.
* Volunteers receiving the VEE vaccine before EEE and WEE vaccines showed higher antibody response rates (80.6%) compared to those receiving EEE and WEE first (66.7%).
* Significant odds of VEE antibody non-response were observed when EEE and WEE vaccines were administered first (OR=2.20), with a notable gender effect (OR=1.81 for females).

Conclusions:

* The order of administration of alphavirus vaccines critically impacts antibody response.
* Antibody interference and gender are significant factors influencing vaccine efficacy.
* Findings have major implications for designing optimal vaccination schedules and developing next-generation alphavirus vaccines.