Gram-positive cocci and Bacteriodes spp怎么翻译啊.尤其是SPP是啥意思.

洛基英语的老师讲
Gram-positive cocci and Bacteriodes spp 革兰氏阳性菌属性脆弱
spp
abbr.species 种类; species (Latin=two or more species) （拉丁语）两个或两个以上类别; special proficiency pay 熟练特别津贴; surplus personal property 剩余私有财产
再问： Gram-positive cocci 是革兰阳性菌的意思，那Bacteriodes spp呢？？