However, a doctor may discover the sign hypertension in an asymptomatic patient, who does not experience "dis-ease", and the sign indicates a disease state that poses a hazard to the patient. In the worst recorded pandemic of influenza, the 1918 to 1919 Spanish flu, more than 20 million people throughout the world died in less than one year. generic viagra online The art of interpreting clinical signs was originally called semiotics a term now used for the study of sign communication in general in English. An antiviral medication, however, may help. generic viagra online For convenience, signs are commonly distinguished from symptoms as follows: Both are something abnormal, relevant to a potential medical condition, but a symptom is experienced and reported by the patient, while a sign is discovered by the physician during examination or by a clinical scientist by means of an in vitro examination of the patient. The symptoms include a severe cough and shortness of breath, which can become very serious. generic viagra online The term sign is not to be confused with the term indication, which denotes a valid reason for using some treatment. Viral pneumonia is caused when the influenza virus gets into the lungs and causes inflammation and irritation. generic viagra online From this definition, it can be said that an asymptomatic patient is uninhibited by disease. One of the most serious complications of influenza is pneumonia.