It is estimated that the infection rate is 2 percent in Britain, 4 to 6 percent in France, 8 to 10 percent in the United States, and 13 percent in Japan.
Diperkirakan, di Inggris tingkat infeksinya 2 persen, di Prancis 4 hingga 6 persen, di Amerika Serikat 8 hingga 10 persen, dan di Jepang 13 persen.