For terrorism to work it must inspire terror. At the moment 'nutter kills 4 people with machete' will barely make local news.(checks this is the tinfoil hat page) All the Islamic terrorist groups are keeping a low profile these days. Is there any chance one of them nicked the virus from a lab in Wuhan, then went shopping for pangolin eggs/whatever before going home and realising that the bottle was leaking? Probably not, of course, but maybe they think they had a hand in this. Otherwise, why aren't they causing trouble?
Wait for everything to die down, then they'll come back out of the woodwork.