Cov neeg mob pob khaus liab tseem niaj hnub tshwm sim thoob plaws ntiaj teb. Raws li Lub Koom Haum Kev Noj Qab Haus Huv Ntiaj Teb (WHO),tsawg kawg yog 27 lub teb chaws, feem ntau nyob hauv Tebchaws Europe thiab North America, tau lees paub cov neeg mob. Lwm cov ntawv tshaj tawm tau pom cov neeg mob uas tau lees paubhauv ntau tshaj 30.

Qhov xwm txheej tsis tas yuav mushloov mus ua ib qho kev sib kis thoob ntiaj teb, tab sis muaj qee cov cim qhia txog kev txhawj xeeb. Tej zaum qhov tseem ceeb tshaj plaws yog tias tsis yog txhua rooj plaub zoo li muaj feem cuam tshuam, thiab qee rooj plaub cais tsis muaj kev sib txuas meej rau qhov kev sib kis uas twb muaj lawm. Qhov no taw qhia rau qhov teeb meem nrhiav, thiab qhia tias ntau rooj plaub txuas tsis tau pom.