Riko Muranaka

Riko Muranaka is a medical doctor, journalist and recipient of the 2017 John Maddox Prize for fighting to reduce cervical cancer and countering misinformation about the human papilloma virus (HPV) vaccine dominating the Japanese media, despite facing safety threats. Despite the lack of evidence, the HPV vaccine is infamous in Japan due to misattributed adverse effects, with government suspending promotion and coverage. While the World Health Organization (WHO) safety and efficacy information about the vaccine is consistent with Muranaka's reporting, a court ruled against Muranaka in an unrelated slander lawsuit in 2016 for claims of alleged fabrication. Under threat of legal harassment by antivaccine activists, publishers declined some of her works including a book on the HPV vaccine.