What rhymes with retroviruses?

Retroviruses rhymes with:

virus's, irises, virus's, actress's, actresses, choruses, congress', congress's, congresses, cypress's, embarrasses, fortresses, gavras's, heiresses, irises, mattress's, norris's, sampras's, virus's, waitresses, walruses

Retroviruses sounds like:

retrievers, retrovirus

What rhymes with retroviruses?