Jason Beaubien

Haiti used to be a tourist hot spot in the Caribbean. Former U.S. President Bill Clinton regularly recounts how he and Hillary honeymooned in Haiti in 1975. There used to be a hopping Club Med just outside Port-au-Prince, but it closed in the '90s.

Now, the Haitian government is trying to revive some of its former allure, launching an aggressive campaign to market the poorest country in the hemisphere as a vacation hub.

President Michel Martelly says tourism could be a major driver of economic growth and could help lift Haitians out of poverty.

Saturday marks the third anniversary of the powerful earthquake that destroyed much of the Haitian capital, Port-au-Prince. The quake killed roughly 200,000 people and left 1.5 million Haitians homeless.

Despite billions of dollars in international aid and pledges to help Haiti rebuild from the disaster, very little new, permanent housing has been built. And about 350,000 Haitians are still living in squalid, makeshift camps — where they face an array of health challenges.

Most of us do everything possible to avoid mosquitoes. But one Italian researcher literally sacrifices her right arm to keep the lowly insects alive.

Chiara Adolina is studying a new malaria drug, and she needs the little suckers for her experiments. So she feeds them each day with her own blood.

She extends her arm into a mosquito cage to give the insects "breakfast." Several dozen mosquitoes spread across her forearm and jam their proboscises into her skin. "Can you see how fat they become?" she says. "Look at that tummy."

Counterfeit drugs are a growing scourge around the world. They're generating millions of dollars in revenue for organized crime and fueling the rise of drug-resistant parasites.

Anti-malarials are among the most popular drugs to fake. But these faux pharmaceuticals are particularly dangerous because malaria can kill a person in a matter of days.

Global efforts to combat malaria are under threat from new strains of drug-resistant malaria, which are cropping up in Southeast Asia.

Over the last decade, the number of malaria deaths around the world has dropped sharply, from just over 1 million in 2000 to roughly 600,000 last year.

Much of that progress is due to the widespread use of drugs containing artemisinin. The new malaria drugs quickly kill the parasite.

The Nigerian government has been slow to fulfill a promise it made last spring. And, its sluggishness is putting kids at risk for lead poisoning, the advocacy group Humans Rights Watch says.

Last May, the Nigerian government pledged roughly $5 million to clean up lead contamination around illegal gold mines in northwest Nigeria. But so far, that money hasn't been released.

Pakistan has made a lot of progress this year in wiping out polio. There are signs that one type of poliovirus is gone and transmission of other strains seems to be slowing.

But a recent outbreak of polio there has health officials concerned about the overall effectiveness of the effort to eliminate polio in that country.

Malaria remains a huge problem in much of the world, but over the past decade the number of people getting sick and dying from the disease has gone down dramatically.

Health workers attribute much of this progress to the widespread use of artemisinin-based drugs. The problem now is that resistance to these drugs is starting to develop in Southeast Asia.

For malaria in Southeast Asia, there's good news and bad news right now. Overall, the number of cases is down, but there's a growing problem of drug resistance in the cases that do crop up.

Researchers worry that superstrains of the parasite — strains immune to the most common medications — could wipe out the recent progress against malaria.

Polio was eliminated from the Western Hemisphere in the early 1990s. It was stamped out in Europe a few years later. And now, even the Congo and Somalia are polio free.

But in Africa's largest oil-producing nation, Nigeria, polio has been a difficult, contentious foe.

Sixty years ago, polio was one of the most feared diseases in the U.S.

As the weather warmed up each year, panic over polio intensified. Late summer was dubbed "polio season." Public swimming pools were shut down. Movie theaters urged patrons not to sit too close together to avoid spreading the disease. Insurance companies started selling polio insurance for newborns.

The fear was well grounded. By the 1950s, polio had become one of the most serious communicable diseases among children in the United States.

Gold in general has great PR. It's slick, it's hip, it's bling. But in a remote corner of West Africa, it's killing children.

Lead from illegal gold mines in northwestern Nigeria has sparked what Doctors Without Borders has called the worst case of environmental lead poisoning in years.

The catastrophe is part of the fallout from the collapse of the U.S. housing market.

Across a swath of northern Nigeria, a humanitarian catastrophe is unfolding, as lead from illegal gold mines sickens thousands of children.

More than 400 kids have died, and many more have been mentally stunted for life.

Doctors Without Borders, which has set up clinics to treat the children, is calling it one of the worst cases of environmental lead poisoning in recent history.

If you want to witness the health consequences of unsafe gold mining in northwestern Nigeria, the first thing you have to do is get to the mines

There's a crisis of severe lead poisoning near the mines that's killed hundreds of children and made thousands more sick.