<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.kufuatia mabadiliko hayo, afrika kusini imesema wiki hii itasitisha matumizi ya chanjo ya astrazeneca kwa sababu haifanyi kazi katika kuzuia maambukizi dhaifu na ya wastani.  <response>: in the wake of the mutations, south africa said this week it would suspend use of the astrazeneca vaccine because it is not effective in preventing mild and moderate infections. 