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dedylja [7]
3 years ago
12

Who developed the polio vaccine? Alan Freed David Reisman Betty Friedan Jonas Salk

History
2 answers:
Elza [17]3 years ago
6 0

The correct answer is Jonas Salk, as he developed the first polio vaccine in 1952.

Two types of polio vaccine are used. The first was developed by Jonas Salk, first tested in 1952 and released on April 12, 1955. The Salk vaccine against poliomyelitis consists of an injected dose of inactivated or killed poliovirus (IPV). The second vaccine was an oral vaccine developed by Albert Sabin using attenuated poliovirus (OPV). Clinical trials of the Sabin vaccine started in 1957 and was authorized in 1962.

Through the use of the two vaccines, polio eradication has been achieved in most of the world and the incidence of 350,000 cases estimated in 1988 has been reduced to 37 cases reported in 2016.


gavmur [86]3 years ago
5 0
The person who developed the Polio vaccine is the American Jonas Salk , He developed the vaccine against the Polio and it was first tested in 1952. (there was a bad outbreak of Polio in the US that year).
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An airplane flies 3080 km from Houston to New York in 4 hours what is the speed of the airplane
Lorico [155]

Answer:

The speed of the airplane is approximately 770 km/h (214 m/s).

Explanation:

Speed = \frac{distance}{time}

Distance = 3080 km

Time = 4 hours

speed = \frac{3080}{4}

           = 770

speed = 770 km/h

The speed of the airplane is 770 km/h.

OR

Distance = 3080 km

But,

1 000 m = 1 km

3080 km = 3080000 m

distance = 3080000 m

Time = 4 hours

60 seconds = 1 minute

60 minutes = 1 hour

Thus, 4 hours = 60 x 60 x 4

                       = 14400 seconds

Therefore,

speed = \frac{3080000}{14400}

           = 213.8889

speed ≅ 214 m/s

The speed of the airplane is approximately 214 m/s.

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Explanation:

Hope this helps you as much as intended.

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