measles broke out in 2014
... that vaccine coverage at schools around the Disneyland Resort was too low for herd immunity when measles broke out in 2014?
... that vaccine coverage at schools around the <a href="./Disneyland_Resort" id="mwBiw" rel="mw:WikiLink" title="Disneyland Resort">Disneyland Resort</a> was too low for <a href="./Herd_immunity" id="mwBi0" rel="mw:WikiLink" title="Herd immunity">herd immunity</a> when <b id="mwBi4"><a href="./Disneyland_measles_outbreak" id="mwBi8" rel="mw:WikiLink" title="Disneyland measles outbreak">measles broke out in 2014</a></b>?