A day after Panacea Biotec Limited bagged orders worth ₹1,040 crore from UNICEF and Pan American Health Organization, its shares surged by 20% to hit the upper circuit of ₹160.8 apiece during Tuesday's opening session. The pharmaceutical company will supply its WHO pre-qualified paediatric vaccine, Easyfive-TT. At 11:18 am, its stock was trading 18.25% higher at ₹158.45 apiece on BSE.