Once a pig catches flu, it will never be able to heal.
Make sure you ship them right away.
When you see the pig status and it says(not in good condition),that shows that the pig is one step closer to catching the flu.
Make sure you take preventive measures.
To prevent the flu,
1)Clean up the poop (to lower the percentage of getting ill)
2)If you see a flu pig, ship them right away (or it'll spread throught your pigsty)
3)Take a vaccine injection (to completely prevent it)
Poop cleaning is the basic of preventing it, but using
poomba, cleaning pig, air conditioning may rarely create a flu pig.
Although there are tools to lower the percentages, it doesn't mean that it completely prevents flu pigs.
If you want to completely prevent it, we recommend you to inject a vaccine for them.
(※1)An already vaccine injected pig will never become a flu pig, but pigs who didn't inject vaccines still have a probability of getting infected by their own poop.