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.
Duration of Flu Symptoms. The duration of flu symptoms will vary from person to person. One of the main reasons is because the strength of the immune system varies from one person to another. Some people are able to get over the flu and shorten the duration of flu symptoms much faster than others. However, seasonal flu will usually last at least a few days after it has been contracted. Duration of flu symptoms may be longer than a few days, and can extend up to 14 days. It is important to note what flu symptoms are, so that everyone can take the appropriate steps at the onset of these symptoms.