@misc{indiciae4662b3e68da0,
  title = {Immunisation and herd immunity.},
  author = {R M Anderson and R M May},
  year = {1990},
  doi = {10.1016/0140-6736(90)90420-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/1969023/},
  note = {Source identifier: 1969023}
}