Latent infection refers to the presence of viral genes in a certain tissue or cell after a dominant or recessive infection, but it does not produce an infectious virus but can be activated under certain conditions to cause an acute attack. The virus is only detected in the non-onset period when the clinical intermittent acute attack occurs, and it cannot be isolated and collected by general medical methods. For example, after herpes simplex virus type 1 infection, lurking in the trigeminal ganglion, the body has neither clinical symptoms nor viral discharge. Later, because the body is affected by physical, chemical, or environmental factors, the latent virus will multiply. Herpes simplex occurs along the sensory nerve to the skin. Another example is varicella-zoster virus (VZV). The initial infection mainly caused chickenpox in children, and the virus was latent in the sensory ganglion cells of the posterior root ganglion or cranial nerve of the spinal cord after the illness, and it was temporarily inactive. When the body's immune function declines, the latent virus activates, proliferates, and spreads along the nerve trunk to the skin to develop herpes zoster.
Cushions in various shapes, sizes, and designs, and they are often covered with fabric or leather.
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