Serum specimens from patients with proved pernicious anemia were tested for the presence of blocking and precipitating antibodies by the methods of Gottlieb et al. 5 and Jacob and Schilling 8 ...

These immunogens elicit cross-reactive antibodies to group 2 influenza viruses and could be used in combination with group 1 HA stem-ferritin immunogens as a universal influenza vaccine.