The expert invokes pig infections, Singapore, then mentions bat origins, though SARS-CoV-2 most ancient ancestor may actually be a pig virus rather than a bat virus. Obama-Biden administration funded research at Duke-NUS, Singapore.
That history comes from avermectin knowledge:
1979 / Lobster Neuromuscular Junction / Avermectin-GABA
Avermectin B1a, a macrocyclic lactone with broad spectrum anthelmintic activity, affects neuromuscular transmission in the lobster stretcher muscle. Perfusion of the muscle with 1-10 microgram of the drug per ml eliminates inhibitory postsynaptic potentials within a few minutes. Intracellularly...
pubmed.ncbi.nlm.nih.gov
’....Avermectin B1a blocks the firing of the crayfish stretch receptor neuron....relative permeability of the GABA channel to foreign anions....’