What is "spp"?

[mel turner]

In article <4auemc$kcc at hpg30a.csc.cuhk.hk> s935537 at acs.csc.cuhk.hk (Ricky Leung) writes:

>     I have found some scientific names of organism end with "spp.".
>   For example, Staphylococcus spp. and Salmanella spp.
>   I wonder to know what they mean. Are the meaning of "spp." the same?

      It is the standard abbreviation for "species" (plural)  ["species" 
(singular)  is abbreviated "sp."].    All this usage means is that the 
particular species names are being left unspecified [perhaps they are 
unknown], but there is more than one of them.
mdt