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satellite images appear to show mass graves outside of mariupol. an adviser to the mayor says they show mass graves. but cnn cannot independently verify those claims. and the discovery happening as the heavy fighting continues in the port city. an estimated 100,000 people, both soldiers and civilians, trapped amid the relentless russian onslaught. one small boy praying for a miracle. >>. >> translator: i want toss the sun so when our houses are rebuilt, we can live in peace, so we can live in ukraine, because this is our native home. another humanitarian corridor opening in mariupo...

Drive protection. >> reporter: like b-cells which can make more antibodies if the virus comes back and t-cells which help activate the immune system and get rid of infected cells. antibodies in your blood naturally wane over time. think of it like security lights at your home. when there's an intruder nearby, they should turn on. but when there's no more threat, you want them to turn back off. >> reporter: why do we focus so much on antibodies? >> one aspect is that antibodies are probably one of the easiest to measure in the laboratory. >> the immunity you get from prior covid infection has b...