Currently I have a work around that maps all MetaPhlAn2 terms from kingdom to species to NCBI TaxIDs. Strains can't be mapped because there is no "strain" level in NCBI. In some cases, taxa below species in NCBI were raised to species in MetaPhlAn2. What to do with them is an open question. Leaving them as is may cause inconsistency when comparing to other profilers. Merging them to higher level species / genus will reduce the resolution of MetaPhlAn2.
Currently I have a work around that maps all MetaPhlAn2 terms from kingdom to species to NCBI TaxIDs. Strains can't be mapped because there is no "strain" level in NCBI. In some cases, taxa below species in NCBI were raised to species in MetaPhlAn2. What to do with them is an open question. Leaving them as is may cause inconsistency when comparing to other profilers. Merging them to higher level species / genus will reduce the resolution of MetaPhlAn2.