▁spread ▁of ▁cont ag ious ▁dise ases . ▁Vari ous ▁forms ▁of ▁isol ation ▁ ▁exist , ▁and ▁are ▁applied ▁depending ▁on ▁the ▁type ▁of ▁in fection ▁and ▁agent ▁involved , ▁and ▁its ▁route ▁of ▁transmission ▁, ▁to ▁address ▁the ▁lik elihood ▁of ▁spread ▁via ▁air bor ne ▁particles ▁or ▁dro ple ts , ▁by ▁direct ▁skin ▁contact , ▁or ▁via ▁contact ▁with ▁body ▁flu ids . ▁ ▁In ▁cases ▁where ▁in fection ▁is ▁merely ▁sus pected , ▁individuals ▁may ▁be ▁quar ant ined ▁until ▁the ▁inc ub ation ▁period ▁has ▁passed ▁and ▁the ▁disease ▁manifest s ▁itself ▁or ▁the ▁person ▁remains ▁health y . ▁Gr oups ▁may ▁under go ▁quar antine , ▁or ▁in ▁the ▁case ▁of ▁communities , ▁a ▁cord on ▁san itaire ▁may ▁be ▁im posed ▁to ▁prevent ▁in fection ▁from ▁spread ing ▁beyond ▁the ▁community , ▁or ▁in ▁the ▁case ▁of ▁protect ive ▁se quest r ation , ▁into ▁a ▁community . ▁Public ▁health ▁authorities ▁may ▁implement ▁other ▁forms ▁of ▁social ▁dist ancing , ▁such ▁as ▁school ▁clos ings , ▁when ▁need ing ▁to ▁control ▁an ▁ep ide mic . ▁ ▁Out break ▁investigation ▁ ▁When ▁an ▁unusual ▁cluster ▁of ▁ill ness ▁is ▁noted , ▁in fection ▁control ▁teams ▁undert ake ▁an ▁investigation ▁to ▁determine ▁whether ▁there ▁is ▁a ▁true ▁disease ▁out break , ▁a ▁pseudo - out break ▁( a ▁result ▁of ▁cont am ination ▁within ▁the ▁di agnostic ▁testing ▁process ), ▁or ▁just ▁random ▁fl uct u ation ▁in ▁the ▁frequency ▁of ▁ill ness . ▁ ▁If