Pengaruh komposisi dan cara pemberian vaksin DNA Hemaglutinin dan Neuraminidase virus influenza a H1N1 terhadap respon antibodi spesifik mencit BALB/C = Effect of the composition and administration methode of DNA vaccine Hemagglutinin and Neuraminidase of the H1N1 influenza a virus to specific antibody response of BALB/C mice