▁a ▁true ▁out break ▁is ▁discovered , ▁in fection ▁control ▁pract ition ers ▁try ▁to ▁determine ▁what ▁permitted ▁the ▁out break ▁to ▁occur , ▁and ▁to ▁rear range ▁the ▁conditions ▁to ▁prevent ▁on going ▁propag ation ▁of ▁the ▁in fection . ▁ ▁O ften , ▁bre aches ▁in ▁good ▁practice ▁are ▁responsible , ▁although ▁sometimes ▁other ▁factors ▁( such ▁as ▁construction ) ▁may ▁be ▁the ▁source ▁of ▁the ▁problem . ▁ ▁Out break s ▁investig ations ▁have ▁more ▁than ▁a ▁single ▁purpose . ▁These ▁investig ations ▁are ▁carried ▁out ▁in ▁order ▁to ▁prevent ▁additional ▁cases ▁in ▁the ▁current ▁out break , ▁prevent ▁future ▁out break s , ▁learn ▁about ▁a ▁new ▁disease ▁or ▁learn ▁something ▁new ▁about ▁an ▁old ▁disease . ▁Re ass uring ▁the ▁public , ▁minim izing ▁the ▁economic ▁and ▁social ▁dis ruption ▁as ▁well ▁as ▁teaching ▁ep ide mi ology ▁are ▁some ▁other ▁obvious ▁object ives ▁of ▁out break ▁investig ations . ▁ ▁According ▁to ▁the ▁W HO , ▁out break ▁investig ations ▁are ▁meant ▁to ▁detect ▁what ▁is ▁causing ▁the ▁out break , ▁how ▁the ▁path ogen ic ▁agent ▁is ▁transm itted , ▁where ▁it ▁all ▁started ▁from , ▁what ▁is ▁the ▁car rier , ▁what ▁is ▁the ▁population ▁at ▁risk ▁of ▁getting ▁inf ected ▁and ▁what ▁are ▁the ▁risk ▁factors . ▁ ▁Training ▁in ▁in fection ▁control ▁and ▁health ▁care ▁ep ide mi ology ▁Pract ition ers ▁can ▁come ▁from ▁several ▁different ▁educational ▁streams . ▁Many ▁begin ▁as ▁n urs es , ▁some ▁as ▁medical ▁techn olog ists