acc ines ▁to ▁Sam oa . ▁T ong a ▁and ▁F iji ▁have ▁also ▁declared ▁states ▁of ▁emer gency . ▁ ▁The ▁out break ▁has ▁been ▁attributed ▁to ▁a ▁sharp ▁drop ▁in ▁meas les ▁v acc ination ▁from ▁the ▁previous ▁year , ▁following ▁an ▁incident ▁in ▁ 2 0 1 8 ▁when ▁two ▁inf ants ▁died ▁shortly ▁after ▁receiving ▁meas les ▁v acc in ations , ▁which ▁led ▁the ▁country ▁to ▁susp end ▁its ▁meas les ▁v acc ination ▁program . ▁The ▁reason ▁for ▁the ▁two ▁inf ants ' ▁death s ▁was ▁incorrect ▁prepar ation ▁of ▁the ▁v acc ine ▁by ▁two ▁n urs es ▁who ▁mixed ▁v acc ine ▁pow der ▁with ▁exp ired ▁an est h etic . ▁As ▁of ▁November ▁ 3 0 , ▁more ▁than ▁ 5 0 , 0 0 0 ▁people ▁were ▁v acc in ated ▁by ▁the ▁government ▁of ▁Sam oa . ▁ ▁Appro ach ▁V acc ine ▁hes it ancy ▁is ▁challeng ing ▁and ▁optimal ▁strateg ies ▁for ▁approaching ▁it ▁remain ▁uncertain . ▁Many ▁inter vent ions ▁designed ▁to ▁address ▁v acc ine ▁hes it ancy ▁have ▁been ▁based ▁on ▁the ▁information ▁def ic it ▁model . ▁This ▁model ▁assumes ▁that ▁v acc ine ▁hes it ancy ▁is ▁due ▁to ▁a ▁person ▁lack ing ▁the ▁necessary ▁information ▁and ▁attempts ▁to ▁provide ▁them ▁with ▁that ▁information ▁to ▁solve ▁the ▁problem . ▁Despite ▁many ▁educational ▁inter vent ions ▁attempting ▁this ▁approach , ▁am ple ▁evidence ▁indicates ▁providing ▁more ▁information ▁is ▁often ▁in effect ive ▁in ▁changing ▁a