2548939 We have a vaccine. CK 1 3264785 I understand a new vaccine is being tested. CK 1 3360466 They've been working on a new vaccine. CK 682301 In 2010, there was a shortage of H1N1 vaccine. Source_VOA 682300 Jonas Salk developed the polio vaccine in 1952. Source_VOA 680217 Vaccines deliver antibodies that fight disease. Source_VOA 682299 Scientists haven't found a vaccine for cancer yet. Source_VOA