I believe all humans do have the right to health care, but at the same time the access is limited to the local culture. If you're speaking about someone living in a tribe, cut off from the world, then they more than likely have their own doctor. In these communities, they usually have a doctor of some kind and that doctor treats everyone in the tribe. This should translate when society becomes large, everyone is important. Everyone needs health care.
Every single country in the world should do what is right and follow Canada. When you decide to be the ruler of a country, you should do what is right and keep everyone safe and healthy. No one should ever be denied health care for any single reason. It should always be free.
Yes, all humans have the right to health care. I believe that our modern society has evolved to the point where we should actively improve the quality of life. Health care is an important aspect of living that everyone deserves. In fact, providing health care for everyone, is a great way to prevent disease and not just treat it.
The providing of health care should be universal. What we're really talking about is whether or not those that can't afford health care should have it subsidized by the state. The answer is yes. Disease doesn't discriminate. A virus recognizes no boundary between the affluent and the poor. It has been shown in a number of studies that healthier populations are more productive populations. Such an idea should be intuitively obvious, but I guess not.