Four baggage handlers at Frankfurt Airport have contracted malaria after investigators believe they were bitten by a single mosquito that travelled undetected on an arriving aircraft.
The infections were identified on July 16, with airport officials saying the workers were likely bitten in the preceding days.
All four were employed in the baggage-handling area of one of Germany's busiest airports.
Authorities believe the infected mosquito escaped detection after arriving on a flight, although investigators have not yet established which aircraft it travelled on.
The incident has prompted concern that further cases could emerge among airport staff.
The rare phenomenon is known as "airport malaria" and affects people who have not travelled to countries where the disease is endemic.
It occurs when an infected mosquito leaves an aircraft and bites people working or living near an airport.
Just 145 cases were recorded worldwide between 1969 and 2024, including nine in Germany.
Four baggage handlers at Frankfurt Airport have contracted malaria
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Malaria is caused by parasites transmitted through mosquito bites and can lead to fever, chills and severe headaches.
The disease can prove fatal if left untreated, according to the World Health Organisation.
Airport staff have been told to monitor themselves for sudden rises in temperature and report any fever symptoms to health authorities immediately.
Workers have also been advised to specifically mention "airport malaria" when seeking medical treatment.
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Malaria is caused by parasites transmitted through mosquito bites
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An airport spokesman said extensive disease-prevention measures were already in place, while acknowledging that isolated mosquitoes hiding aboard aircraft could not be completely prevented.
It is the second case of malaria linked to Frankfurt Airport in recent years, following a similar incident in 2023.
Investigators are continuing to examine the circumstances surrounding the latest infections.
However, officials stressed that current evidence suggested neither passengers passing through the airport nor nearby residents faced any increased risk of contracting the disease.
'Airport malaria' occurs when an infected mosquito leaves an aircraft and bites people working or living near an airport
|GETTY
The outbreak comes after Britons were warned by health officials to take precautions against mosquito-borne illnesses this summer following concerning new infection data.
The UK Health Security Agency has issued guidance after figures revealed that Zika virus cases imported into the country have already surpassed last year's annual total.
Between January and June 2026, eight Zika infections were recorded, exceeding the seven cases documented throughout the whole of 2025. Half of these originated from Indonesia.
The agency warned that mosquito-transmitted diseases including dengue fever and Zika can pose serious health risks for certain individuals.
Travellers are being advised to apply insect repellent, dress in long-sleeved clothing and trousers, and use treated bed nets where appropriate.