Signs and symptoms

 Bird flu viruses are complex, with a number of subtypes and strains that vary considerably from one another. In the broadest terms, however, the viruses are classified as having a low or high chance of causing disease (Low or high pathogen city).

Among bird’s the effects of low pathogenic viruses are usually minor-ruffled feathers or reduced egg production. But highly pathogenic forms cause severe disease, including respiratory distress, and almost 100 percent mortality in susceptible species. In some cases, domestic birds may die the same day symptoms appear. 

Scientist do not yet know just how these subtypes affect humans but highly pathogenic viruses appear to cause the most serious problems and the greatest number of deaths in both people and animals. 

Influenza Virus

Attract Human

 

Although the exact incubation period for bird flu in humans is not clear, illness seems to develop within one to five days of exposure to the virus. Some times the only indication of the disease is a relatively mild eye infection(conjunctivitis). But more often, signs and symptoms of bird flu resemble those of conventional influenza  including 1) cough 2)fever 3)sore throat 4)muscle aches.

People with the most virulent type of bird flu virus A) H5NI- may develop life-threatening complications, particularly viral pneumonia and acute respiratory distress, the most common cause of bird flue related deaths.