"They're doing that because they're sampling the environment and building their immunity. That's an evolutionary trait," Sawyer says.
 "Vanoita zvinhu izvi nekuti vanenge vachiri kuona kuti munharaunda yavari inechi uye vachivaka simba remauto emumiviri yavo. Ndizvo zvinoitika mukukura nekushanduka kunoita vanhu nemhuka kuti vagone kurarama maringe neshanduko iri kuitiia munharauda dzavanenge vachigara madziri" Sawyer anodaro.