Android viruses are infecting my phone
Before using any steps backup your personal data
Use a Bloatware free Stock-Rom or Custom rom which has support of your Android Phone. You can find your phone's stock rom on XDA-Developers forum.
Now comes the flashing step.

You can do it in two ways:-

1. Flashing from androd Recovery Mode in TWRP. Requires root
See Here to know how you can do it:-
https://www.google.com/search?q=flashing+roms+with+twrp

2. Flashing rom from PC. This doesn't requires root.
See here to know how to do it:-
https://www.google.com/search?q=how+to+install+custom+rom+on+android+using+pc

These steps will remove the virus apps which were in your root and will give your phone a relief.