Even before the pandemic, epidemiological evidence suggested that children in more developed countries, where handwashing and the use of sanitizer are more prevalent, might have less-developed immune systems compared to kids in developing nations who are routinely exposed to more bacteria, viruses and allergens.
Ngaphambi kwesifo sikazwelonke, ubungqina be-epidemiology bacebisa ukuba abantwana abakumazwe aphuhlileyo, apho ukuhlanjwa kwezandla kunye nokusetyenziswa kwesicoci sezifo kuxhaphake kakhulu, banokuba namajoni omzimba angaphuhlisiyo xa kuthelekiswa nabantwana abakumazwe asakhasayo abasoloko bedibana neebhaktheriya ezininzi, iintsholongwane kunye nezinto ezinokuthi zenzeke.