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.
Kunyangwe denda redzihwamupengo iri risati ravapo, humbowo hwakabuda mukuongorora nzira dzinopararira nadzo zvirwere hwaiita sekuratidza kuti vana vari munyika dzakabudirira kudarika dzimwe, uko kuno nyanyoshandiswa sipo dzekugezesa maoko nemishonga inouraya hutachiona hwemumaoko, vanogona kuva nemasoja emumuviri asina kukura nekusimba zvichienzaniswa nevana vari munyika dzichiri kubudirira, avo vanosangana nehutachiona hunokonzera zvirwere, twumbuyu, matenda nezkusagadzikana kwehutano.