What is the difference between Salk and Sabin vaccines?
In the developing world, however, outbreaks of poliovirus still occur sporadically, an ironic consequence of the polio vaccine itself. The polio vaccine comes in two types: the Salk vaccine, made with a killed virus and the Sabin vaccine, made with a live but weakened, or attenuated, virus.
Why did Salk not patent his vaccine?
Could you patent the sun?” The vaccine is calculated to be worth $7 billion had it been patented. However, lawyers from the National Foundation for Infantile Paralysis did look into the possibility of a patent, but ultimately determined that the vaccine was not a patentable invention because of prior art.
How many shots was the Salk vaccine?
Case reports in Illinois declined from a high of 4,002 in 1952 to 307 in 1957 and continued downward thereafter. The Salk vaccine (also known as an inactivated polio vaccine) consists of a series of three shots given just under the skin.
What is Salk vaccine used for?
polio vaccine … inactivated poliovirus vaccine (IPV) or Salk vaccine, was developed in the early 1950s by American physician Jonas Salk. This vaccine contains killed virus and is given by injection. The large-scale use of IPV began in February 1954, when it was administered to American schoolchildren.
Does polio vaccine give lifelong immunity?
Production and control of polio vaccines Poliovirus infection can provide lifelong immunity against the disease, but this protection is limited to the particular type of poliovirus involved (Type 1, 2, or 3). Infection with one type does not protect an individual against infection with the other two types.
Which is better IPV or OPV?
The IPV that has been used in the United States since 1987 is as effective as OPV for preventing polio. Two doses of IPV provides 90% immunity (protection) to all three types of poliovirus; 3 doses provides at least 99% immunity.
Is polio vaccine for life?
It is not known how long people who received IPV will be immune to poliovirus, but they are most likely protected for many years after a complete series of IPV.