@misc{indiciae43cef94e8aa9,
  title = {Active and Passive Immunization in Typhus Fever.},
  author = {H Zinsser and M R Castaneda},
  year = {1934},
  doi = {10.1073/pnas.20.1.9},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587848/},
  note = {Source identifier: 16587848}
}