de ▁present ▁in ▁v acc ines ▁with ▁cancer . ▁ ▁Sud den ▁infant ▁death ▁synd rome ▁Sud den ▁infant ▁death ▁synd rome ▁( S ID S ) ▁is ▁most ▁common ▁in ▁inf ants ▁around ▁the ▁time ▁in ▁life ▁when ▁they ▁receive ▁many ▁v acc in ations . ▁Since ▁the ▁cause ▁of ▁S ID S ▁has ▁not ▁been ▁fully ▁determined , ▁this ▁led ▁to ▁concerns ▁about ▁whether ▁v acc ines , ▁in ▁particular ▁di ph ther ia - t et anus ▁to x oid ▁v acc ines , ▁were ▁a ▁possible ▁caus al ▁factor . ▁Several ▁studies ▁investig ated ▁this ▁and ▁found ▁no ▁evidence ▁supporting ▁a ▁caus al ▁link ▁between ▁v acc ination ▁and ▁S ID S . ▁In ▁ 2 0 0 3 , ▁the ▁Institute ▁of ▁Medicine ▁fav ored ▁re jection ▁of ▁a ▁caus al ▁link ▁to ▁D Tw P ▁v acc ination ▁and ▁S ID S ▁after ▁review ing ▁the ▁available ▁evidence . ▁Add itional ▁anal ys es ▁of ▁V A ERS ▁data ▁also ▁showed ▁no ▁relationship ▁between ▁v acc ination ▁and ▁S ID S . ▁In ▁fact , ▁evidence ▁is ▁mount ing ▁that ▁v acc ination ▁may ▁protect ▁children ▁against ▁S ID S . ▁ ▁Anth ra x ▁v acc ines ▁When ▁the ▁U . S . ▁military ▁began ▁requiring ▁its ▁troops ▁to ▁receive ▁the ▁anth ra x ▁v acc ine , ▁multiple ▁US ▁military ▁troops ▁refused ▁to ▁do ▁so , ▁which ▁led ▁to ▁thre ats ▁of ▁military ▁courts ▁mart ial . ▁ ▁Sw ine ▁flu ▁v acc ine ▁During