Munster have revealed there have been nine further positive cases of Covid-19 among their travelling players and staff in South Africa.
This followed another round of PCR testing in Cape Town.
The remaining party of 38 have returned negative results and are isolating in their hotel rooms.
Another round of PCR testing will take place today and upon results of those, Munster may be able to make a determination about travel back to Ireland for those who are not carrying the virus.
The individuals affected by the positive cases - the nine today and a previous case, will remain in Cape Town until the end of their isolation period.
Today's news places the ability of Munster to adequately prepare for and fulfil the Heineken Champions Cup game against Wasps on Sunday December 12th in doubt.
In a statement on the province's website this morning, Munster said:
"The ten members of the group who have tested positive will remain in Cape Town until the end of their isolation period. While the individuals were disappointed on receiving the news they are thankfully well and will continue to be monitored medically at this time.
"We understand this is a challenging situation and would like to thank families, friends, colleagues and our rugby community for the many messages of best wishes."
