not interested in the toilet anymore!

I am having issues with my 3 year old DS.

back at the beginning of april we decided to try and TT him as we felt he was ready. he was doing really well with maybe 1-2 accidents a day until he got sick just before easter. he regressed to the point now that he wont even show any interest in the toilet. I have tried to get him to go in with other kids to see if that would make him interested, asked him if he needs to go, taken him with me or DH when we need to go, not pushing him in anyway, but he just doesn't seem interested. even day care has noticed that he no longer goes into the bathroom there to have a look or flush the toilets. I just don't know how to get him interested anymore.

does anyone have any ideas?

TIA xx