Here is the full text:
A select number of antiviral agents known to inhibit viruses other than retroviruses were also evaluated. These included the anti-herpetic drugs acyclovir (ACV), ganciclovir (GCV), vidarabine (ara-A), 5-Iodo-2′-deoxyuridine (IdUrd), penciclovir (PCV), foscarnet (PFA), vistide (HPMPC); the anti-hepatitis drugs entecavir (ETV), telbivudine (LdT), and ribavirin (RBV). ETV was also selected because it was recently reported to inhibit HIV-1 replication, both in vitro and in humans . Other compounds claimed to be effective against XMRV, MLV, HIV-1 and other viruses, such as chloroquine , dehydroepiandrosterone (DHEA) , methylene blue and aspirin were also evaluated for anti-XMRV activity in vitro. Methylene blue is known to have antiherpetic activity and also can inactivate HIV-1 . Unfortunately, most of the compounds listed above, except IdUrd were ineffective against XMRV, or were effective at toxic concentrations (Figure 1). IdUrd demonstrated a low therapeutic index (TI, the ratio of CC50/EC50) and cannot be considered as a specific antiviral agent against XMRV.
so antivirals didn't work. doesn't look like they checked artesunate.