I believe in the past when Dr Chia treated enterovirus ME/CFS patients with interferon, he used 3 million IU of interferon alpha injected subcutaneously 3 times weekly, with the course of treatment lasting a few months.
Dr Chia's paper
says:
Combination therapy, Interferon α-2b (Intron-A, Schering-Plough) 3 million units was administered subcutaneously 3 times a week, along with 400 mg ribavirin, twice a day, to 5 patients who were enteroviral RNA positive and continued to have high titers of neutralizing antibody for CBV.
Dr Chia has in the past used interferon alpha often in combination with inflammation gamma or delta. See
this article.
Many of these patients made dramatic improvements from interferon, like from bedbound to back to work, but they would usually relapse several months to a year later (presumably because interferon does not fully clear the virus, so it eventually returns).
Chia stopped using interferon treatment for a while, because he found that patients could not tolerate it (it causes worsening of symptoms, plus often depression). See
this video at 3:51.
But I heard recently that Dr Chia has started using interferon beta occasionally now, but only for hospitalized bedbound ME/CFS patients. After two weeks of interferon beta, he finds they can start walking around the hospital, whereas before they could not leave their beds due to PEM.
Of interest:
https://me-pedia.org/wiki/Interferon