Anywhere you have extreme poverty and no national health insurance, no promise of health care regardless of social standing, that's where you see the sharp limitations of market-based health care.

But if you're asking my opinion, I would argue that a social justice approach should be central to medicine and utilized to be central to public health. This could be very simple: the well should take care of the sick.

We've taken on the major health problems of the poorest - tuberculosis, maternal mortality, AIDS, malaria - in four countries. We've scored some victories in the sense that we've cured or treated thousands and changed the discourse about what is possible.

The biggest public health challenge is rebuilding health systems. In other words, if you look at cholera or maternal mortality or tuberculosis in Haiti, they're major problems in Haiti, but the biggest problem is rebuilding systems.

So I can't show you how, exactly, health care is a basic human right. But what I can argue is that no one should have to die of a disease that is treatable.

If any country was a mine-shaft canary for the reintroduction of cholera, it was Haiti - and we knew it. And in retrospect, more should have been done to prepare for cholera... which can spread like wildfire in Haiti... This was a big rebuke to all of us working in public health and health care in Haiti.

You can't have public health without a public health system. We just don't want to be part of a mindless competition for resources. We want to build back capacity in the system.

It is clear that the pharmaceutical industry is not, by any stretch of the imagination, doing enough to ensure that the poor have access to adequate medical care.

Civil and political rights are critical, but not often the real problem for the destitute sick. My patients in Haiti can now vote but they can't get medical care or clean water.

It is clear that the pharmaceutical industry is not, by any stretch of the imagination, doing enough to ensure that the poor have access to adequate medical care.