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A well being employee in Mali prepares a vaccination that protects towards 5 illnesses: diptheria, tetanus, meningitis, pertussis and hepatitis B. In vials like this one, which comprises a number of doses, thimerosal is used as a preservative that may forestall contamination. Jürgen Bätz/Image Alliance/through Getty Photographs conceal caption toggle caption Jürgen Bätz/Image Alliance/through Getty […]
