An Asahi Shimbun survey shows and medical experts agree that a low vaccination rate and misunderstandings contribute to the measles problem in Japan, with many people believing that one measles vaccination is enough for life, while [some] pharmacologists say the shots' immunity lasts for about five to 10 years. "Among industrialized nations, Japan is the only one that does not vaccinate twice," notes Professor Tatsuo Kato of St. Marianna University School of Medicine. Only an estimated 80 percent of Japanese children even get one measles vaccination. Approximately 100,000 to 200,000 people in Japan contract the measles every year, with 20 to 30 people dying from the disease.