Abstract: Methods, systems, and software are provided for determining whether a subject is afflicted with an oncogenic pathogen. Nucleic acids from a biological sample of the subject are hybridized to a probe set that includes probes for human genomic loci and for genomic loci of oncogenic pathogens. Sequence reads of the hybridized nucleic acid are obtained and it’s determined whether each sequence read aligns to a human reference genome. For each sequence read that fails to align to the human reference genome, it’s determined whether the sequence read aligns to a reference genome of an oncogenic pathogen. Sequence reads that both (i) fail to align to the human reference genome and (ii) align to a reference genome of an oncogenic pathogen are tracked, thereby obtaining a sequence read count for the oncogenic pathogen. The sequence read count is used to ascertain whether the subject is afflicted with the oncogenic pathogen.