sentence: Therefore , viral metagenomics analyses can be improved through better evaluation of MDA bias and potential mitigation approaches.The objective of this study is to understand the inherent variability and biases introduced when conducting DNA viral metagenomic analyses of wastewater , and define a complete procedure to efficiently concentrate and recover viruses , remove extraneous extravirion contaminating DNA , mitigate biases introduced by MDA reactions , and provide a bioinformatic strategy to analyze NGS sequences for viral community analyses .