Because your nose and throat are linked up to your respiratory system, a runny nose and chesty cough are typically the first symptoms to appear when you are infected with influenza. Inside your respiratory system, the influenza virus attaches itself to epithelial cells and binds with it.
When this happens, the cell becomes a replication of the virus, allowing it to further spread throughout your respiratory system. Good question! While influenza is typically found and fought within your respiratory system, sometimes your cells need to fight a little harder to fend off the virus, which means branching out of the respiratory system and into your bloodstream as well.
When your cells do this, it causes your body to react in a variety of different ways. One way is it causes your unaffected cells to produce a substance known as Interleukin-1, which is important as it helps develop specific cells, known as T cells, to help fight the virus. The only downside? Doing so can affect the hypothalamus in your brain. Neurological sequelae of influenza A H1N1 in children: a case series observed during a pandemic.
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