Equity market seems to be unnerved by this whole national-wide...

Equity market seems to be unnerved by this whole national-wide lock-down, dragging the economy with it for sure. For most sectors, their revenue will be reduced significantly in short to medium term, or even longer if the outbreak is not controlled.

For MSB, nothing really has changed in terms of getting FDA and delivering life-saving stem-cell treatment to patients.
I don't see why virus outbreak could derail MSB delivering new life-saving treatment to people from commercial and government perspective, as opposed other sectors such as retail, entertainment where large gathering is not allowed.

I have continued to hold. While the share price has not gone up, but to me the value is increasing, given stem-cell treatment utility (it's even trying to treat the coronavirus.

Good luck! I also look to Its ADR listing, MESO as an secondary, but earlier indicator of MSB value, given the majority of clinical trials, discussion and FDA all happening in the US time zone.