The flu is a contagious disease caused by influenza virus respiratory causes (there are many different strains). Flu virus in nasal secretions, saliva of patients, the disease is transmitted from person to person is not infected with influenza when tiny water droplets containing the flu virus shot from the nose, mouth sick person coughs, sneezes or through direct contact. The disease is very contagious, one day before the onset of symptoms, the patient was able to transmit the virus to someone else and continue spreading in the next days
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