My son who has (just) been fully vaccinated has just been diagnosed with the virus. Cold type symptoms, did a lateral flow test on Wednesday and got a very, very faint second line. Had PCR test dame day and it was confirmed positive yesterday. His fiancée who he lives with did a lateral flow test yesterday, same faint line. PCR test yesterday, negative result this morning. Both have done several lateral flow tests again today and both are showing negative. His second vaccination was two weeks to the day on Wednesday so he may not have built up enough antibodies especially as he was ill with food poisoning on the day of his second jab.