@CNN: Scientists worldwide are seeking improved and universal flu vaccines. In one new study, researchers used a mutant influenza A virus to develop a vaccine that gave the immune systems of mice and ferrets a significant boost https://t.co/Gwl5uxKmAN https://t.co/JALVKGUtXX

@CNN: Scientists worldwide are seeking improved and universal flu vaccines. In one new study, researchers used a mutant influenza A virus to develop a vaccine that gave the immune systems of mice and ferrets a significant boost https://t.co/Gwl5uxKmAN https://t.co/JALVKGUtXX