old but good12 May 2020 14:32
https://erj.ersjournals.com/content/erj/50/1/1601953.full.pdf
the last line sums it up:
"We suggest pharmacological Tyk2 inhibition as an immune modulatory intervention strategy to sustain the crucial endogenous GM-CSF levels in severe viral/bacterial pneumonia"
also
Here we show that use of the pharmacological Tyk2 inhibitor (PRT2070) fully restored pneumococcal-induced alveolar macrophages IL-1ß and finally epithelial GM-CSF after IAV infection in human lung co-infection. This is of particular interest with regard to clinical trials in pneumonia-associated ARDS patients receiving GM-CSF treatment. The systemic administration in the trial by PAINE et al. [23] did not reveal significant effects, but a first compassionate inhalative application with a low number of cases by HEROLD et al. [22] showed positive
tendencies of pulmonary host defence modulation. If GM-CSF treatment were successful, compared to IFN receptor pathway inhibition, fewer adverse effects are likely. However, if one single factor such as GM-CSF is not sufficient to restore the entire pulmonary host defence against secondary bacterial pneumonia, an early IFN receptor pathway modulation with, for example, clinically developed Tyk2 inhibitors would offer a further promising approach, since we not only restored endogenous GM-CSF, but also demonstrated a beneficial effect of Tyk2 inhibition on reduction of bacterial growth.
frankly I'd be amazed if SAR wasn't being analysed thoroughly by a number of big pharma.