Scientistshavecalledthemove a verypositivedevelopment, butit's notclearyetwheretheantibodiesactuallyprotectagainst a newinfection.
HisourmedicalcorrespondentFergusWalsh.
It's whatmillionsofBritonswanttoknow.
HavetheyalreadyhadCoronavirus?
Nowit's possibletofindoutforsure.
With a bloodtest, ithastogothroughlabanalysis.
Thiscouldbedonebyhand, likehereatImperialCollegeLondonorinanautomatedprocess, like a new, highlyaccurateantibodytestapprovedforuseintheUKIfyougetinfectedwithCoronavirus, yourimmunesystemstartstoproduceantibodies.
Remember, it's a swabtestlikethis, whichwillshowifyourcurrentlyinfectedwithCoronavirusthanksverymuchsothisremainscrucialinpreventingthespreadoftheviruswell.
Meanwhile, a clearerpictureisbeginningtoemergeoffthescaleoftheCoronavirusoutbreakinEngland.
Officialestimatessuggestthatduring a twoweekperiodatthestartofthismonth, nearly 150,000 people, oroneinevery 400 hadcovert 19.
Well, Fergusisherewithmenowandgrisly.
Thesewerenotpeopleinhospitalorcaroms.
Yes, thiscamefrom a surveyoff 11,000 volunteersaroundEnglandwhoperformedswabtestsathomeonfromthatattheOfficeforNationalStatisticshasworkedoutthataroundonein 400 peopleinEnglandatthemomenthave a currentCoronavirusinfection.