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Related Concept Videos

Development of Immunocompetence01:22

Development of Immunocompetence

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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
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Factors Affecting the Risk of Infection01:26

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The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Introduction to Innate and Adaptive Immunity01:21

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The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Changes in Immune Function during Initial Military Training.

Adrienne Hatch-McChesney1, Patrick N Radcliffe, Kenneth P Pitts2

  • 1U.S. Army Research Institute of Environmental Medicine, Natick, MA.

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Military recruits showed increased lymphocytes and T-cell reactivity during initial military training (IMT), indicating maintained immune competence. Epstein-Barr virus reactivation was more common, but other herpesviruses were not detected, suggesting effective immune control.

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Area of Science:

  • Immunology
  • Military Medicine
  • Nutritional Science

Background:

  • Initial military training (IMT) imposes significant physical and psychological stress, potentially compromising immune function and increasing infection susceptibility.
  • Understanding immune system changes during IMT is crucial for maintaining recruit health and operational readiness.
  • Factors like diet quality and latent viral reactivation are important considerations during this demanding period.

Purpose of the Study:

  • To characterize alterations in innate and adaptive immune biomarkers during IMT.
  • To investigate potential modulators of immune changes, including latent herpesvirus reactivation and diet quality.
  • To assess overall immune competence in military recruits post-IMT.

Main Methods:

  • Blood samples were analyzed for leukocyte distribution and cytokine production in response to mitogens.
  • Saliva samples were tested for Epstein-Barr virus (EBV), varicella zoster virus (VZV), and herpes simplex 1 (HSV1) DNA.
  • Diet quality was assessed using the Healthy Eating Index via food frequency questionnaires in 61 US Army recruits before and after 22 weeks of IMT.

Main Results:

  • Lymphocytes and terminally differentiated T-cells (CD4+ and CD8+) increased, while granulocytes and monocytes decreased from pre- to post-IMT.
  • Cytokine responses to anti-CD3/CD28 stimulation were elevated post-IMT, but responses to lipopolysaccharide were blunted.
  • EBV reactivation prevalence increased post-IMT, but VZV and HSV1 reactivation were not detected. Improved diet quality correlated with CD8+ T-cell maturation and reduced pro-inflammatory cytokine responses.

Conclusions:

  • Recruits exhibited lymphocytosis, T-cell subset maturation, and enhanced T-cell reactivity after IMT.
  • Increased EBV reactivation was observed but appeared effectively managed, suggesting immune competence was not compromised.
  • The absence of VZV or HSV1 reactivation indicates recruits effectively controlled latent viral infections despite IMT stress.