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The MCQ: In which one of the following year, diphtheria vaccine was invented "Diptheria" App Download [Free] with answers: 1924, 1913, 1976, and 1903 for online elementary school classes. Solve Inventions and Inventors Quiz Questions, download Apple e-Book (Free Sample) for school certificate.
In which one of the following year, diphtheria vaccine was invented?
The first successful vaccine for diphtheria was developed by
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