How Long Does Butter Last? How long does butter last? Butter lasts for about 6-9 months in the refrigerator and if there is a best by date stamped on the package then it will last for at least a month beyond that date, that is if it has been stored properly.
Jonas Salk is credited with developing the first polio vaccine in 1955, an injected vaccine containing killed virus, but the oral live vaccine devised a little later by his competitor Albert Sabin is the workhorse of the Global Polio Eradication Initiative.onas Salk is credited with developing the first polio vaccine in 1955, an injected vaccine containing killed virus, but the oral live vaccine devised a little later by his competitor Albert Sabin is the workhorse of the Global Polio Eradication Initiative.
Tuesday is the 100th anniversary of the birth of Jonas Salk, who invented the vaccine. ROBERT SIEGEL, HOST: A lethal disease threatening the American public, a race against time to prevent its spread-this is not the story of Ebola, but of the fight against polio 60 years ago.e haven't seen a case of polio in the United States in close to 30 years, and that's because we vaccinate. SIEGEL: Gives us a sense of the impact that the successful testing of the Salk vaccine had on Jonas Salk.