If you are not allowed to enter Brazil due to Brazil closing borders, you will receive a full refund.
If your country is not permitting you to travel due to border closures within your country, you will receive a partial refund of $1500.
If you are not able to make it to the clinic due to your flight being canceled, or due to you getting COVID prior to travel, you will not receive any refund. You may wish to fly to Brazil a day or 2 earlier to hedge against this (unlikely) possibility.
That being said, I have been traveling throughout COVID (USA, Mexico, Brazil, Kenya, Spain, Italy, France, South Africa etc.) and I have not had a single flight canceled, except for during March 2020. My friends have also been traveling with great success. I think we are past those days, thankfully.
This may sound harsh, but please be aware that even if you are not able to make it, I still have to pay my staff and the resort to run this clinic. Your kind understanding is much appreciated.