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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.
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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
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Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
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Opportunities to accelerate immunization progress in middle-income countries.

Jason Zhu1, Clarke B Cole1, Johanna Fihman2

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Summary
This summary is machine-generated.

Middle-income countries face vaccine access challenges, worsened by COVID-19. Improving immunization coverage could save thousands of lives, requiring coordinated global and regional support for these nations.

Keywords:
COVAXCOVID-19CoverageGaviGlobal policyIA2030ImmunizationMiddle income countriesNew vaccine introductionUNICEFVaccinationWHO

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Area of Science:

  • Global Health
  • Immunization Programs
  • Vaccine Access

Background:

  • Middle-income countries (MICs) face significant vaccine access challenges, particularly those ineligible for or transitioned from Gavi, the Vaccine Alliance support.
  • The COVID-19 pandemic has exacerbated existing immunization program difficulties in MICs, risking delayed vaccine introductions, decreased coverage, and increased inequity.
  • Improving immunization outcomes in MICs offers substantial potential health and equity benefits.

Purpose of the Study:

  • To identify actionable strategies for accelerating immunization progress in middle-income countries.
  • To leverage new global platforms and regional mechanisms for coordinated support to MICs.
  • To address vaccine access challenges and improve immunization coverage in Gavi-transitioned and non-Gavi eligible countries.

Main Methods:

  • Analysis of vaccine access challenges in middle-income countries.
  • Modeling the impact of new vaccine introductions and increased coverage.
  • Conducting comprehensive, multi-stakeholder consultations to identify key areas for action.

Main Results:

  • Introduction of pneumococcal, rotavirus, and HPV vaccines in MICs by 2020 could have saved an estimated 70,000 lives at 90% coverage.
  • Increasing coverage of existing vaccines to 90% could have saved an additional 16,000 lives.
  • Existing efforts and new global platforms (Gavi 5.0, Immunization Agenda 2030) present opportunities for aligned strategies and support.

Conclusions:

  • Coordinated global and regional efforts are crucial to address immunization barriers in middle-income countries.
  • Actionable strategies identified through multi-stakeholder consultations must be implemented, adapting to country-specific contexts.
  • Harnessing opportunities from global platforms and pandemic response can strengthen long-term immunization support for MICs.