For individual infections among the 2006–2007 group, 6.3% carried K1 type, 2.7% carried MAD20 type, 14.3% carried RO33 type, and 76.7% had multiple allelic types (i.e. K1/MAD20, K1/RO33, MAD20/RO33, and K1/MAD20/RO33). This evidence concerns the gene KRT1 and infection.