Table 2 Relative abundance of the top 20 bacterial, archaeal, eukaryotic and viral species in the classrooms of high schools in Shanxi, China. The species are ordered according to the abundance. “uc” means uncharacterized.

uc Actinobacteria

5.10

Candidatus Nitrocosmicus oleophilus

0.0029

Alternaria alternata

0.222

Neospora caninum

0.065

Silicibacter phage DSS3phi2

0.044

uc Psychrobacter

3.21

Candidatus Nitrosocosmicus exaquare

0.0012

Alternaria solani

0.102

Heteromita globosa

0.010

uc Pa6virus

0.035

Micrococcus luteus

3.08

uc Halobacteria

0.0011

Aspergillus glaucus

0.044

Babesia bigemina

0.005

uc virus

0.029

uc Brachybacterium

1.80

Halorubrum trapanicum

0.0009

uc fungus

0.013

Albugo laibachii

0.005

Psychrobacter phage Psymv2

0.008

Janibacter indicus

1.59

Salinigranum rubrum

0.0008

Malassezia restricta

0.009

uc Pyropia

0.004

Caudovirales phage

0.004

Kocuria palustris

1.50

Haloterrigena turkmenica

0.0008

Didymella pinodes

0.008

Sterkiella histriomuscorum

0.003

Caudovirales phage

0.004

Serinicoccus sp. JLT9

1.32

Halobacterium hubeiense

0.0006

Mucor racemosus

0.007

Pyropia haitanensis

0.003

Psychrobacter phage pOW20-A

0.003

Kocuria turfanensis

1.27

Haloferax gibbonsii

0.0006

Saccharomyces cerevisiae

0.006

Aureococcus anophagefferens

0.003

Citrus endogenous pararetrovirus

0.003

uc Microbacterium

1.26

Salinarchaeum sp. Harcht-Bsk1

0.0006

Aspergillus aculeatus

0.005

Bodomorpha sp. HFCC57

0.002

Alphapapillomavirus 2

0.002

uc Xanthomonadaceae

1.21

Halorientalis sp. IM1011

0.0005

Stemphylium lycopersici

0.005

Plasmodium vivax

0.002

uc virus

0.002

uc Micrococcales

1.20

uc Candidatus Nitrosocosmicus

0.0005

Parastagonospora nodorum

0.005

Salpingoeca rosetta

0.002

uc Siphoviridae

0.002

Agrococcus carbonis

1.17

Halobiforma lacisalsi

0.0005

Tremella fuciformis

0.004

Emiliania huxleyi

0.002

uc virus

0.001

uc Paracoccus

1.13

Natronococcus occultus

0.0005

Pichia kudriavzevii

0.004

Plasmodium malariae

0.002

Human endogenous retrovirus K

0.001

uc Bacteria

1.12

Halopiger xanaduensis

0.0005

Malassezia globosa

0.003

Cavenderia fasciculata

0.002

uc virus

0.001

Acinetobacter johnsonii

1.11

Halovivax ruber

0.0005

Ustilago hordei

0.003

Colpodella angusta

0.001

Sfi21dt1virus

0.001

uc Nocardioidaceae

0.99

Halopenitus persicus

0.0005

Leptosphaeria biglobosa

0.003

Plasmodium reichenowi

0.001

Cyanobacteria phage AS-1

0.001

uc Streptococcus

0.99

uc Natrialbaceae

0.0005

Aspergillus steynii

0.003

Vaucheria litorea

0.001

Pa6virus

0.001

uc Pseudomonas

0.95

Haloarcula taiwanensis

0.0005

Diaporthe longicolla

0.003

Plasmodium relictum

0.001

Alphapapillomavirus 9

0.001

uc Nocardioides

0.85

uc Archaea

0.0005

Alternaria tenuissima

0.003

Thecamonas trahens

0.001

Mollivirus sibericum

0.001

uc Proteobacteria

0.83

Halobacterium sp. DL1

0.0004

Phoma sp. 1 OB-2014

0.002

Plasmodium sp. DRC-Itaito

0.001

Pseudomonas virus PB1

0.001