Flu

Juz recovered from a flu.....
i had just discovered that.if you had colorless nasal fluid, it means that your flu was caused viral infection;
If you had green yellowish fluid, it means that it was a bacterial infection.
So what happens when u had colorless in the beginning and then turn to green yellowish few days later???
It means that in the beginning, you were infected by virus,
If u did not heal on time, the virus will weaken your immune system allowing the bacteria to attack our body.
Therefore, green yellowish nasal fluid normally appears when your flu is getting worse.