Padziko lonse lapansi, kuchuluka kwa katemera wa chikuku kumayendera limodzi ndi kuchepa kwamphamvu kwa matendawa.

Mu 1980, anthu pafupifupi 2,6 miliyoni amafa chifukwa cha chikuku chaka chilichonse padziko lonse lapansi. Mu 2001, WHO ndi UNICEF adakhazikitsa njira yoperekera katemera yomwe idachepetsa chiwerengero cha imfa ndi 80%.⁹. Ku France, panali milandu yopitilira 500 pachaka isanafike 000, ndipo 1980 yokha mpaka 40 milandu mu 45-2006.¹⁰. Komabe, kuyambira pa January 1, 2008, mliri wakula ku France ndi ku Ulaya. Mu Epulo 2011, mayiko 33 ku Europe anena kuti odwala chikuku awonjezeka kwambiri. Kuyambira tsiku limenelo, malinga ndi Institute for Public Health Surveillance, milandu yopitilira 14 ya chikuku yalengezedwa ku mainland France, ndipo mwina pali milandu yochepera 500.

Mliri udakhudzanso Quebec, yomwe idalemba milandu pafupifupi 750 mu 2011, motsutsana ndi mlandu umodzi kapena iwiri yazaka zam'mbuyomu. Kuwonjezeka kumeneku muzochitika kumagwirizana mwachindunji ndi kutsika kwa chiwerengero cha anthu omwe ali ndi katemera.