https://t.co/DF40S9biYF
Unfortunately the observed ORF8 inactivation or the nsp6 SGF deletion are both indicative of T cell depletion, yet the deletion of HV and Y suggest functional B cell immunity—specifically the HV deletion is not observed in the patient nor the ORF8
![](https://pbs.twimg.com/media/Ep2IYFSU0AExmBI.jpg)
Which happened to be a requirement for human infection fitness,
https://t.co/Ytdb1hkZdU
Also suggest a mouse host (which hosts non-Heparan sulfate binding MHV A59 and other non-cell passaged MHV strains) being likely.
Notice that for this other case the same kind of deletion—multiple AAs in the S position 144 and no deletion at S position 69-70, and a single deletion in the nsp1 removing a single Methionine residue, was found. This indicate functional B and T cell
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