@misc{indiciae8ad219a01f5a,
  title = {Immunity to smallpox.},
  author = {R J BLATTNER},
  year = {1952},
  doi = {10.1016/s0022-3476(52)80135-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/12991185/},
  note = {Source identifier: 12991185}
}