Vaccine efficacy in the context of "Randomized controlled trial"

COVIran Barekat (Persian: کووایران برکت) is a COVID-19 vaccine developed in Iran by Shifa Pharmed Industrial Group, a subsidiary of the Barkat Pharmaceutical Group. It is an inactivated virus-based vaccine. Iranian authorities have authorized its emergency use. This makes it the first locally developed COVID-19 vaccine to be approved for emergency use in the Middle East.

Officials in charge say they are in the process to publish the results of the clinical trials in a peer-reviewed journal. The interim results of the phases 1 and 2 trials showed 93.5% (95% CI, 88.4–99.6%) of the receivers of the vaccine have produced neutralizing antibodies against SARS-CoV-2. Those results have not been peer-reviewed and describe the immunogenicity of the vaccine and not its efficacy. On 3 March 2022, peer-reviewed results have been published in the Clinical Microbiology and Infection.

Human papillomavirus (HPV) vaccines are vaccines intended to provide acquired immunity against infection by certain types of human papillomavirus. The first HPV vaccine became available in 2006. Currently there are six licensed HPV vaccines: three bivalent (protect against two types of HPV), two quadrivalent (against four), and one nonavalent vaccine (against nine) All have excellent safety profiles and are highly efficacious, or have met immunobridging standards. All of them protect against HPV types 16 and 18, which are together responsible for approximately 70% of cervical cancer cases globally. The quadrivalent vaccines provide additional protection against HPV types 6 and 11. The nonavalent provides additional protection against HPV types 31, 33, 45, 52 and 58. It is estimated that HPV vaccines may prevent 70% of cervical cancer, 80% of anal cancer, 60% of vaginal cancer, 40% of vulvar cancer, and show more than 90% effectiveness in preventing HPV-positive oropharyngeal cancers. They also protect against penile cancer. They additionally prevent genital warts (also known as anogenital warts), with the quadrivalent and nonavalent vaccines providing virtually complete protection. The WHO recommends a one or two-dose schedule for girls aged 9–14 years, the same for girls and women aged 15–20 years, and two doses with a 6-month interval for women older than 21 years. The vaccines provide protection for at least five to ten years.

The primary target group in most of the countries recommending HPV vaccination is young adolescent girls, aged 9–14. The vaccination schedule depends on the age of the vaccine recipient. As of 2023, 27% of girls aged 9–14 years worldwide received at least one dose (37 countries were implementing the single-dose schedule, 45% of girls aged 9–14 years old vaccinated in that year). As of September 2024, 57 countries are implementing the single-dose schedule. At least 144 countries (at least 74% of WHO member states) provided the HPV vaccine in their national immunization schedule for girls, as of November 2024. As of 2022, 47 countries (24% of WHO member states) also did it for boys. Vaccinating a large portion of the population may also benefit the unvaccinated by way of herd immunity.