It has nothing to do with the theory of  autogenesis. The autogenic hypothesis postulates that the  organelles in eukaryotic cells were formed from the enfolding of  the cell membrane in prokaryotes.
How long does the flu last? For most healthy people, the flu is an uncomfortable but short-term illness that resolves itself as the immune system fights it off. Symptoms usually appear from one to four days after exposure to the virus, and they last five to seven days. For people who've had a flu shot, the symptoms may last a shorter amount of time, or be less severe. For other people, the symptoms may last longer. Even when symptoms resolve, you may continue to feel fatigued.
To answer to âhow long does the flu last?â I offer this information. First, there is a period of incubation from the time you are exposed to the flu virus to the time you start suffering the signs and symptoms and that period is approximately 1-5 days.The flu virus definitely works fast!!During this period, a person is contagious from about the day before they started becoming ill to approximately five days after that. The worst and most common symptoms tend to last from anywhere from three to ten days in most healthy adults.he flu virus definitely works fast!! During this period, a person is contagious from about the day before they started becoming ill to approximately five days after that. The worst and most common symptoms tend to last from anywhere from three to ten days in most healthy adults.