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.
Ndetse na mbere y’icyorezo, ibimenyetso by’ibyorezo byerekanaga ko abana bo mu bihugu byateye imbere cyane, aho gukaraba intoki no gukoresha isuku byiganje, bashobora kuba bafite sisitemu y’umubiri idateye imbere ugereranije n’abana bo mu bihugu bikiri mu nzira y'amajyambere bakunze guhura na bagiteri nyinshi, virusi na allergene. .