Unajua vaccines are designed to be weakened pathogens. Sasa ukiwa unaweakening unaeza ukajikuta unastrengthen au ukabadili mbinu za huyo pathogen. Ukatengeneza new trains Ambazo zaweza kuwa dangerous zaid.
Sasa hawa wa corona hatuwaamin kabisa. Maana kuna vita za kichini chini.
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