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FLU and VIRUS infections to the respiratory tract have been quite a common infestation and history since the existence of mankind.
The potency of the Virus is strongest during the peak of the winters and the change in climatic conditions, when the immune system is at the weakest.
It’s the very nature of a virus to create a better self each year, with a better characteristic and a stronger new generation every year, and the only defense that can destroy them is the strong human body itself with the symptoms of fever, headache, nasal and oral discharges.