1. Poliomyelitis prevention in the United States. Introduction of a sequential vaccination schedule of inactivated poliovirus vaccine followed by oral poliovirus vaccine. Recommendations of the Advisory Committee on Immunization Practices (ACIP) CDC – MMWR. 1997;46:1–25. https://www.cdc.gov/mmwr/preview/mmwrhtml/00046568.htm
2. Swartz TA. The epidemiology of polio in Israel - a historical perspective. In: Israel Center for Disease Control (ICDC) Ministry of health, Dyonon Pub. Ltd.; 2008.
3. Position paper on polio vaccines and polio immunization in the pre-eradication era. WHO weekly epidemiological record 2010; 23: 213–228. http://www.who.int/wer/2010/wer8523.pdf?ua=1
4. Davidovitch FK. The two drops campaign against polio which was conducted in Israel in 2013. Knesset research and information center 2014 [in Hebrew] https://www.knesset.gov.il/mmm/data/pdf/m03374.pdf
5. Fine P, Eames K, Heymann DL. Herd immunity: a rough guide. Vaccine. 2011;52:911.