First of all thyphoid doesn't spread due to burnt food.
And as Rash said on many occassions she has asked Shefali to check and second she won't know which Paratha will come into Sids plate..
Now we have seen Rash is so affected by this statement that she has got somebody sick.
Although he was irritated with Sana that day, She asked him parathas once he was leaving although he is still in recovery mode he denied that.
She made halwa with Devo he took so much time to eat..
Today he is not eating Paratha/papad which Asim has made and Rash just brought..
Sids sarcasm is actually little ott..