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.
Well like many medical breakthroughs, there were a succession of findings by many scientists which led to an ultimate polio vaccine. But it was a scientist by the name of Dr Jonas Salk who, with the help of his colleagues at University of Pittsburgh Medical School, discovered the polio vaccine itself.Dr Jonas Salk was the son of Orthodox Polish-Jewish immigrants and was born in New York in 1914.owever there are other notable scientists who were either directly or indirectly involved with the discovery of the polio vaccine... Perhaps the most notable were Harvardâs Johns Enders and his team, who collectively discovered how to grow polio in test tubes a few years before the polio vaccine was discovered.