For example, the genome of the serotype M18 group of Streptococcus pyogenes associated with acute rheumatic fever contains 178 ORFs not present in the genomic sequence of an M1 serotype .
比如说,M18组的致病性链球菌(可导致急性风湿癥而引起发热癥状)所含有的第178号鹅口疮(致病基因)在M1组的链球菌属中就无法找到。