链球菌属（Streptococcus）是化脓性球菌中的另一大类常见革兰阳性球菌。有69个种和亚种，广泛分布于自然界和人体的鼻咽部、胃肠道等处，大多为正常菌群。致病性链球菌可引起人类多种化脓性炎症及超敏反应性疾病。链球菌属中对人类致病的主要是A群链球菌和肺炎链球菌。
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这包括革兰阴性菌种系列，以及链球菌属。
This included an array of gram-negative bacteria species, as well as Streptococcus spp.
沙子中的链球菌属种群在夏末“爆发”，尽管当时沙子已经从奶牛场移除了三到四个月。
The Streptococcus spp. population in the sand "exploded" during the late summer, even though at that time the sand had been removed from the dairy for three to four months.
比如说，M18组的致病性链球菌（可导致急性风湿症而引起发热症状）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。
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 .
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