This may be a foolish thought but, viruses may have free reign to evolve and multiply in immunocompromised hosts.
O.K. this virus may have evolved in bats but - people with their immune systems compromised even for a short period of time could they possibly host evolution of a virus?
O.K. this virus may have evolved in bats but - people with their immune systems compromised even for a short period of time could they possibly host evolution of a virus?