Travel to Health

Figure 1. Schematic representation of the host immune response against microbial pathogens (Source: 18).  Allergy and hypersensitivity reactions in general are traditionally thought of as misguided or excessive reactions by the immune system, possibly due to broken or underdeveloped mechanisms of peripheral tolerance. Hypersensitivity reactions are immune mediated responses that occur in pre-sensitized hosts . [41]  These reactions can be classified into four categories:   Type I, anaphylactic , mediated by IgE;   Type  II, cytotoxic , mediated by antibodies recognizing self-antigens;   Type  III, immune complex , caused by deposition of antigen-antibody complexes in tissues, leading to the tissue-damaging effects of complement and leukocytes (e.g. Arthus type reaction); and   Type  IV, delayed-type hypersensitivity , which is not mediated by antibodies but by T cells. Naive CD4 T helper cells differentiate into different C...

The main problem with severe COVID-19 infection is the inflammatory response leading to intubation; a more severe inflammatory response can lead to low blood pressure and multisystem organ failure. Altered Immune Signature Linked to Long-Covid Most people with Covid-19 recover within two weeks. Some, as reported in [15], with so-called  Long Covid  (symptoms lasting longer than three weeks), continue to experience excessive fatigue, breathlessness, headache, insomnia, muscle fatigue and pains, chest pains, persistent cough, intermittent fevers and brain fog.  The  study  finds about  10%  had symptoms  for a month , with between  1.5 and 2%  after  three months . The  median age  of those with  Long Covid  is  45 , and  women are more likely to be affected . In a study, scientists in University of Manchester have discovered that, significantly, an immune signature associated with long-Covid patient...

Cutaneous wound healing is a complex procedure involving the interaction between different cells in the injured tissue, including inflammatory cells, fibroblasts , keratinocytes , and endothelial cells . [7,8]  These cells contribute to healing process by releasing various chemo-cytokines and growth factors in a cell type specific manner to stimulate inflammation, angiogenesis , wound contraction and remodeling. TGF-β is involved in a number of processes in wound healing: inflammation, stimulating angiogenesis, fibroblast proliferation, collagen synthesis and deposition and remodelling of the new extracellular matrix. Interestingly chronic, non-healing wounds often show a loss of TGF-β1 signaling. [13] There are several options for the treatment of cutaneous wounds, which are grouped into three categories: [5] Dressings Topical gels Engineered skin The process of wound healing has to be well orchestrated and disruption of this process, for instance due to the infection o...