Health Alert Network (HAN) No. 420 - Nationwide Shortage of Tuberculin Skin Test Antigens: CDC Recommendations for Patient Care and Public Health Practice 6/6/2019 11:30 AM Health Alert Network (HAN) No. 419 - Influenza Season Continues with an Increase in Influenza A(H3N2) Activity 3/28/2019 2:15 PM.