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.
Also in Slate: Jonas Salk didnât patent the polio vaccine, but Google Doodlesâlike todayâs on Salkâare patented. On April 12, 1955, Edward R. Murrow asked Jonas Salk who owned the patent to the polio vaccine. âWell, the people, I would say,â Salk responded. âThere is no patent.