How come nobody knew about this?

After 2AM's Jo Kwon was diagnosed with Swine Flu on October 27th, the rest of the 2AM members were tested and Jinwoon was diagnosed positive on November 1st.

JYP Entertainment stated to Newsen on the 6th:

"Jinwoon took tamiflu and was tested again on the 5th with Jo Kwon. Results came in on the 6th and everyone is now cured. The rest of the members are also in good condition."

Well, that's good news, I guess I can't wish him a speedy recovery since he's already cured though.

cr: allkpop