Most of these characteristics disappear with 3 to 7 days, but some may last for at least another week.
Influenza is complicated by bacterial pneumonia. It is more serious in the elderly and immune-compromised.
These viruses can cause flu like symptoms but they aren't influenza.
But symptoms can also be caused by bacteria (such as Tuberculosis), Fungi, and medical treatments (including flu vaccines).
Here is an interactive guide for defining your symptoms as cold, flu, or allergies.