1. World Health Organization (2022, December 10). Vaccines and Immunization. Available online: https://www.who.int/health-topics/vaccines-and-immunization#tab=tab_1.
2. Centers for Disease Control and Prevention (CDC) (2022, December 20). Vaccines and Immunizations, Available online: https://www.cdc.gov/vaccines/index.html.
3. Centers for Disease Control and Prevention (CDC) (2022, December 20). Pregnancy and Vaccination, Available online: https://www.cdc.gov/vaccines/pregnancy/vacc-during-after.html.
4. (2022, December 20). CDC Statement on Pregnancy Health Advisory, Available online: https://www.cdc.gov/media/releases/2021/s0929-pregnancy-health-advisory.html.
5. Centers for Disease Control and Prevention (CDC) (2022, December 10). Vaccine Safety. Questions and Concerns. Vaccines During Pregnancy FAQs, Available online: https://www.cdc.gov/vaccinesafety/concerns/vaccines-during-pregnancy.html.