Now that we know about both prokaryotic and eukaryotic cells, let's look at the endosymbiosis theory. This theory suggests that mitochondria and plastids in eukaryotic cells were once independent prokaryotic cells.
Avian influenza (AI) is an infectious viral disease of birds (especially wild water fowl such as ducks and geese), often causing no apparent signs of illness. AI viruses can sometimes spread to domestic poultry and cause large-scale outbreaks of serious disease.
These precautionary measures could reduce the possibility of infection with avian and human influenza viruses. Avian Flu Symptoms for Humans: All poultry workers should know the signs and symptoms of avian influenza virus infection in humans so that measures can be taken for immediate treatment. The signs and symptoms may include fever, cough, sore throat, conjunctivitis (eye infections), and muscle aches. Infection with avian influenza viruses can also lead to pneumonia, acute respiratory distress and other severe and life-threatening complications.