@misc{indiciae9275d25d8e5b,
  title = {Smallpox and smallpox vaccination.},
  author = {Anthony G Letai},
  year = {2003},
  doi = {10.1056/nejm200305083481914},
  url = {https://pubmed.ncbi.nlm.nih.gov/12736287/},
  note = {Source identifier: 12736287}
}