Table 1.

The list of contaminant families found in the negative control samples.

Family *	Negative Control Sample
Beggiatoaceae, Coralloluteibacterium, Coprothermobacteraceae, Anaerolineaceae, Elsteraceae, Pirellulaceae	Paraffin
Staphylococcaceae, Carnobacteriaceae, Xanthobacteraceae	Paraffin, reagents
Enterobacteriaceae, Cellulomonadaceae, Promicromonosporaceae	Reagents
Flavobacteriaceae, Propionibacteriaceae, Lactobacillaceae, Lachnospiraceae, Pasteurellaceae, Oscillospiraceae, Anaerovoracaceae, Micrococcaceae, Christensenellaceae, Comamonadaceae, Streptococcaceae, Beijerinckiaceae, Chitinophagaceae, Sanguibacteraceae, Yersiniaceae, Spirosomaceae, Microbacteriaceae, Bdellovibrionaceae, Clostridiaceae, Nocardioidaceae, Hyphomicrobiaceae, Iamiaceae, Acidaminococcaceae, Actinomycetaceae, Idiomarinaceae, Muribaculaceae, Prevotellaceae, Rikenellaceae	Surface swab
Microscillaceae, Hungateiclostridiaceae, Moraxellaceae, Bacillaceae, Sphingomonadaceae, Sphingobacteriaceae, Caulobacteraceae, Alcaligenaceae, Reyranellaceae, Ruminococcaceae	Surface swab, paraffin
Pseudomonadaceae, Xanthomonadaceae, Rhizobiaceae	Surface swab, reagents, paraffin

* Bacterial families first identified as laboratory contaminants are shown in boldface type.