ancy ▁has ▁contributed ▁to ▁the ▁res urg ence ▁of ▁prevent able ▁disease . ▁For ▁example , ▁in ▁ 2 0 1 9 , ▁the ▁number ▁of ▁meas les ▁cases ▁increased ▁by ▁ 3 0 % ▁world wide ▁and ▁many ▁cases ▁occurred ▁in ▁countries ▁that ▁had ▁nearly ▁elimin ated ▁meas les . ▁ ▁Stockholm , ▁small po x ▁( 1 8 7 3 – 7 4 ) ▁An ▁anti - v acc ination ▁campaign ▁motiv ated ▁by ▁religious ▁ob jections , ▁concerns ▁about ▁effect iveness , ▁and ▁concerns ▁about ▁individual ▁rights ▁led ▁to ▁the ▁v acc ination ▁rate ▁in ▁Stockholm ▁dro pping ▁to ▁just ▁over ▁ 4 0 %, ▁compared ▁to ▁about ▁ 9 0 % ▁elsewhere ▁in ▁Sweden . ▁A ▁major ▁small po x ▁ep ide mic ▁began ▁there ▁in ▁ 1 8 7 3 . ▁It ▁led ▁to ▁a ▁rise ▁in ▁v acc ine ▁u pt ake ▁and ▁an ▁end ▁of ▁the ▁ep ide mic . ▁ ▁Vietnam ▁During ▁the ▁Vietnam ▁War , ▁v acc ination ▁was ▁necessary ▁for ▁soldiers ▁to ▁fight ▁over se as . ▁Because ▁disease ▁follows ▁soldiers , ▁they ▁had ▁to ▁receive ▁v acc ines ▁prevent ing ▁ch ol era , ▁influen za , ▁meas les , ▁men ing oc occ emia , ▁B ub onic ▁pl ague , ▁pol i ov irus , ▁small po x , ▁t et anus , ▁di ph ther ia , ▁ty ph oid , ▁ty ph us , ▁and ▁yellow ▁fe ver . ▁However , ▁the ▁dise ases ▁mainly ▁pre val ent