<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.matokeo yalionyesha ufanisi wa chanjo ya astrazeneca ilitegemea kipimo, na ikaanguka kwa 62 tu wakati ilipopewa dozi mbili kamili badala ya kipimo cha nusu kwanza.  <response>: the effectiveness of astrazenecas vaccine depended on the dosing, and fell to 62 percent when given as two full doses rather than a half-dose first. 