@misc{indiciae5ce8b7a3bf68,
  title = {Vaccination programmes and herd immunity.},
  author = {R M May},
  year = {1982},
  doi = {10.1038/300481a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/7144901/},
  note = {Source identifier: 7144901}
}