@Caravanfan My respect for you just went up because you admitted a possible mistake in an earlier post.
I still disagree with your assessment as it applies to Trump. From your link:
“A large contact tracing study demonstrated that high-risk household and hospital contacts did not develop infection if their exposure to a case patient started 6 days or more after the case patient’s illness onset (Cheng et al., 2020).”
Even six days, I think, is too much in the case of somebody who can be tested by the PCR test repeatedly. My understanding is the PCR test picks up even minor amounts of virus:
“Although replication-competent virus was not isolated 3 weeks after symptom onset, recovered patients can continue to have SARS-CoV-2 RNA detected in their upper respiratory specimens for up to 12 weeks (Korea CDC, 2020; Li et al., 2020; Xiao et al, 2020). Investigation of 285 “persistently positive” persons, which included 126 persons who had developed recurrent symptoms, found no secondary infections among 790 contacts attributable to contact with these case patients. Efforts to isolate replication-competent virus from 108 of these case patients were unsuccessful (Korea CDC, 2020).”
In any case, if replication-competent virus is present in a previously infected patient’s upper respiratory specimens, s/he should isolate. The question is: What if they are not?