# Add\_viruses giving peculiar result

**URL:** <https://forum.biobakery.org/t/add-viruses-giving-peculiar-result/2274>\
**Category:** MetaPhlAn\
**Created:** [June 20, 2021, 1:11pm UTC](https://forum.biobakery.org/t/add-viruses-giving-peculiar-result/2274 "2021-06-20T13:11:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![saras22](https://avatars.discourse-cdn.com/v4/letter/s/59ef9b/32.png) [@saras22](https://forum.biobakery.org/u/saras22)\
**Post date:** [June 20, 2021, 1:11pm UTC](https://forum.biobakery.org/t/add-viruses-giving-peculiar-result/2274/1 "2021-06-20T13:11:19Z")

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Hello @f.asnicar  
I used add\_viruses flag for my samples and it gave very peculiar result for just one sample as compared to results of other samples. For a particular sample it is giving me 84% relative abundance for a Micobacterium phage but when not using add\_viruses for that sample I get 95% bacteria. Please explain why is that happening. Also in all other samples I have added the virus flag but it gave reasonable result which is detecting almost under ~20% viral diversity. What is the explanation for this?

Thanks  
Saraswati Awasthi