3 · en
Short, simple sentences with “vaccine”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
The vaccine protects against the bacillus that causes diphtheria.
Natural vaccine against diarrhoea: Breast milk, besides being the best food a baby can receive, is a natural vaccine against any type of infection.
In 1954, Jonas Salk obtained the first injectable vaccine against polio, while three years later, Willem Kolff developed the first artificial heart.
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