German national Hans Moselewski works in shipping and regularly travels around the world.
He's had malaria three times, once so seriously that he nearly died.
Now Hans recognises the symptoms, and as soon as he starts to feel the characteristic shaking and fever, he books himself into the hospital.
He said: "I had it very seriously once and I would have died had I not been here in the London School of Hygiene and Tropical Medicine.
"This time I had a smaller dose of malaria and they did not think I had it, but because I had the symptoms I wanted to come here."
Bite risk
Malaria is a parasitic infection of the blood and is transmitted by bites from mosquitoes.
It kills over a million people worldwide each year and is second only to tuberculosis in its impact on world health.
The disease is currently present in 90 countries, and Hans thinks he picked up his infection while travelling from Nigeria to Equatorial New Guinea.
"This time when I got ill I started with the shakes and I knew what it was because I had it twice before, once seven years ago and once two years ago."
No pills
Despite having had malaria before, Hans was reluctant to take any medication to prevent it as he had suffered side effects to malaria tablets he had taken previously.
"I did not take anything. I did take this Larium once and I got crazy and this time they did not have anything that I could take."
If spotted and treated quickly malaria can usually be completely cured.
Most UK travellers do survive about of malaria after a 10-20 day illness.
Many of those who die from the disease globally each year do so because the disease is not spotted early enough.
The death rates are particularly high in areas of sub-Saharan Africa, where medical expertise and malarial drugs are limited.
Travellers wanting to cut down their risks should contact their GP or travel clinic to get advice on anti-malarial tablets.
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