<prompt> tafsiri zifuatazo kutoka kwa swahili hadi kiingereza.watu wamepoteza imani na uwezo wa ufanisi wa chanjo,bw biden alisema , na kuongeza kuwa ni muhimu kwa kile atakachofanya rais na makamu rais .  <response>: people have lost faith in the vaccines ability to work, biden said, adding that what a president and vice president do is important. 