For almost two weeks, those affected by deadly Cyclone Idai have been without food and shelter.
But now, they face another adversary - cholera - a waterborne disease that spreads rapidly and can kill within hours if left untreated.
Mozambique's government has now confirmed the first cases in the wake of the disaster.
Fragile patients pour into clinics in the wrecked port city of Beira too weak to walk - seeking urgent rehydration.
Many are children.
Thousands were trapped for more than a week in submerged villages after catastrophic flooding, with no access to clean water, a problem rescue efforts are now targeting to prevent the spread of infection.
Cyclone Idai killed at least 700 people across southern Africa and hundreds of thousands are still displaced.
Mozambique has been hit hardest.
The World Health Organization is sending 900,000 doses of oral cholera vaccine to affected areas, but that will take days to arrive.
Aid is slowly getting to those in need though.
The United Nations refugee agency says three planes will bring relief to 30,000 of those affected by the disaster as the water receeds.
They're asking for $282 million to support the first few months of the rescue effort in Mozambique.
Only 2 percent of that has been funded so far.
Authorities implemented early warning systems ahead of the cyclone but that news didn't reach everyone.
Even if it had there was little shelter to seek refuge from the flood water in more remote areas of the country.