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.
sore throat; sneezing; cough; headache or body aches; mild tiredness; Flu symptoms can include: dry, hacking cough; moderate to high fever, although not everyone with the flu will run a fever; sore throat; shaking chills; severe muscle or body aches ; headache; stuffy and runny nose; severe fatigue that may last up to two weeks ; nausea and vomiting (most common in children) Colds come on gradually over a few days and are often milder than the flu. They usually get better in 7 to 10 days, although symptoms can last for up to 2 weeks. Flu symptoms come on quickly and can be severe. They usually last 1 to 2 weeks. Use your symptoms as a guide to figure out which condition you have. If you think you might have the flu, see your doctor to get tested within the first 48 hours of showing symptoms.