@misc{indiciae3b2474905d2f,
  title = {Immunization against smallpox.},
  author = {C Kaplan},
  year = {1969},
  doi = {10.1093/oxfordjournals.bmb.a070681},
  url = {https://pubmed.ncbi.nlm.nih.gov/4918528/},
  note = {Source identifier: 4918528}
}