So it seems that Djokovic's "medical exemtion" was based on the fact that he claimed virus immunity (and therefore no need to vaccinate) on the basis that he recently had covid.
A report in the
Hobart Mercury on-line seems to place Tennis Australia in a bit of a bind, if they gave him an exemtion based on previos infection/immunity (heavily qualification .. if all as reported, although the article does reproduce the actual letters).
Edit - same report now in the Oz on-line
Two letters from the Department of Health sent to Tennis Australia CEO Craig Tiley have cast doubt over Novak Djokovic’s medical exemption for the Australian Open.
The letters clearly stipulate that players that were unvaccinated but had contracted Covid in the past six months would be denied quarantine-free travel.
The letters were released after Djokovic was denied a visa upon arrival at Melbourne Airport.
The world No 1 touched down at 11pm AEDT Wednesday night and was held under police guard until it was confirmed at 10am AEDT Thursday he would not be granted entry.
According to reports, Djokovic had applied for an exemption based on the fact he had caught the virus in the last six months.
The first letter said: “People who have previously had COVID-19 and not received a vaccine dose are not considered fully vaccinated”.
It adds that these people would “not be approved for quarantine-free entry, regardless of whether they have received foreign vaccination exemptions”.
the same advice was shared in the second latter dated November 29, 2021.