NANCY LAPID THE following is a roundup of some of the latest scientific studies on the novel coronavirus and efforts to find treatments and vaccines for COVID-19. Johnson & Johnson shot may need boosting People who received the one-dose Johnson & Johnson COVID-19 vaccine may need a booster shot to fend off some of the worrisome coronavirus variants now spreading worldwide, a study suggests.A "significant fraction" of blood samples from recipients of the J&J shot had low neutralizing antibody levels against the Delta, Delta Plus, Beta and Lambda variants, according to a report posted on Wednesday on the medical website…