Karma İngilizce Soruları 3 95. Soru

95.

Find the odd sentence

(I)The man credited with developing the first vaccine to fight against the crippling disease polio is the American doctor Jonas Salk. (II) He and his co-workers first tested a polio vaccine against an inactive polio virus in 1952. (III) In 1954, field tests were conducted on a large scale. (IV) Consequently, a number of once deadly diseases have been conquered since the introduction of vaccination. (V) In the end, Salk's vaccine proved the best, and was used without further problems.