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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
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The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
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Blood transfusion is a therapeutic measure to restore the blood volume after extensive blood loss due to an accident or a medical procedure. Blood transfusion involves drawing a certain amount of blood from a suitable donor and infusing it into the recipient.
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Viruses and thrombocytopenia.

Reyhaneh Rasizadeh1,2,3, Fatemeh Ebrahimi2, Atefeh Zamani Kermanshahi2

  • 1Immunology Research Centre, Tabriz University of Medical Sciences, Tabriz, Iran.

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This review explores how viruses cause low platelet counts (thrombocytopenia). Understanding these viral infections and their effects on platelets can lead to better treatments.

Keywords:
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Area of Science:

  • Virology
  • Hematology
  • Immunology

Background:

  • Thrombocytopenia, a condition of low platelet count, has diverse etiologies.
  • Platelets play a crucial role beyond hemostasis, including in immune responses.
  • Viral infections are increasingly recognized as significant contributors to thrombocytopenia.

Purpose of the Study:

  • To review the complex relationship between viral infections and thrombocytopenia.
  • To elucidate the pathophysiological mechanisms linking viruses and platelet depletion.
  • To highlight the role of platelets in the context of viral pathogenesis.

Main Methods:

  • Comprehensive literature review of viral infections associated with thrombocytopenia.
  • Analysis of pathophysiological mechanisms of platelet involvement in viral diseases.
  • Examination of specific viral agents and their impact on platelet counts.

Main Results:

  • Viruses contribute to thrombocytopenia through various mechanisms, including direct viral effects, immune-mediated destruction, and impaired platelet production.
  • Specific viruses like Hepatitis C Virus (HCV), measles virus, and parvovirus B19 demonstrate distinct pathways to induce thrombocytopenia.
  • Platelets are implicated in modulating the host immune response during viral infections.

Conclusions:

  • Viral-induced thrombocytopenia is a significant clinical challenge requiring a deeper understanding of host-pathogen interactions.
  • Elucidating the mechanisms of viral thrombocytopenia is crucial for developing targeted therapies.
  • Further research into platelet function in viral infections may reveal novel preventive and therapeutic strategies.