Dear Dr. Ekawit: I must apply for another sick leave. First of all, I have not fully recovered. Second, it is not safe for other instructors. The rotavirus is not airborn but can be transmitted through the surface 2 days after the full recovery of the infected (my wife got sick today too). Therefore, I would like to take sick leave on Thursday and come back on Monday (Friday is my free day). Best Regards and sorry for trouble. Stan