RE: Variants and efficacy26 Nov 2021 12:14
It shouldn't really make any difference to efficacy outcomes. The efficacy of the drug depends more on the concentrations of INFB required to reduce viral loads and whether the delivery via inhalation can achieved those required concentrations. You can see from the data from the in vitro results for the three early variants (Whuhan, Kent, SA) they each variant required slightly different concentrations of INF B to reach undetectable levels.
The key is that the dosage that the lungs are receiving via nebulisation of SNG001 is much greater (approx 10ul/ml from memory) than these concentrations outlined in the in vitro experiments and is highlight below.
"In vitro experiments were conducted at Viroclinics-DDL in the Netherlands to confirm that SNG001 had activity against the B.1.1.7 (“UK or “Kent”) and B.1.351 (“South African”) variants. In these experiments, Vero E6 cells were treated with SNG001 prior to and after infection with SARS-CoV-2. 16-24 hours after infection, the presence of SARS-CoV-2 viral proteins was determined using an immunostaining method. SNG001 potently reduced virus to undetectable levels in cells infected with “Wuhan- like” (virus strain: Germany/BavPat1/2020), the UK/Kent variant and the South African variant. Concentrations, readily achievable following inhaled delivery of interferon beta, that gave 90% inhibition (IC90) were 3.2, 4.0 and 3.4 IU/mL respectively."