Sep 23, 2026 · 19 min · 9 segments
How do eight people get falciparum malaria in Germany when none of them traveled somewhere malaria is circulating? The answer may be that they didn't have to travel. The mosquito did. This episode…
Heather McSherryHost
[instrumental music] Okay, so when we talk about malaria in places like Germany, or the US for that matter, we're usually talking about imported cases.
Someone travels to a part of the world where malaria is circulating, then an infected Anopheles mosquito bites them, and they return home and later become sick.
That happens regularly enough that a patient's travel history is one of the obvious things a clinician would wanna know if malaria was being considered.
Four airport employees developed symptoms between July 4th and July 6th, close enough together that German public health officials quickly recognized this as something unusual.
The Robert Koch Institute reported the cluster on July 16th, and said investigators believe the infections had likely been transmitted by an infected Anopheles mosquito imported by aircraft.
At that point, four cases were already unusual, but the cluster didn't stop there.
Eventually, five airport workers were identified with illness beginning in early July.
Then, another airport-associated case appeared with symptom onset in mid-August.
Six airport workers, none had recently traveled to a malaria endemic area or received a blood transfusion.
And in September, Frankfurt health officials announced two more cases on September 15th.
Both patients lived in Schwanheim, near the airport, but in separate households.
That brought the total to eight cases and three deaths, and it made the investigation a lot more complicated.
Further complicating things is that we know when these people became ill, but not exactly when they were infected.
With malaria, investigators can work backward from symptom onset to estimate a likely exposure window, but they usually can't identify the individual mosquito bite that transmitted the infection.
[instrumental music] Okay, so when we talk about malaria in places like Germany, or the US for that matter, we're usually talking about imported cases.
Someone travels to a part of the world where malaria is circulating, then an infected Anopheles mosquito bites them, and they return home and later become sick.
That happens regularly enough that a patient's travel history is one of the obvious things a clinician would wanna know if malaria was being considered.
Four airport employees developed symptoms between July 4th and July 6th, close enough together that German public health officials quickly recognized this as something unusual.
The Robert Koch Institute reported the cluster on July 16th, and said investigators believe the infections had likely been transmitted by an infected Anopheles mosquito imported by aircraft.
At that point, four cases were already unusual, but the cluster didn't stop there.
Eventually, five airport workers were identified with illness beginning in early July.
Then, another airport-associated case appeared with symptom onset in mid-August.
Six airport workers, none had recently traveled to a malaria endemic area or received a blood transfusion.
And in September, Frankfurt health officials announced two more cases on September 15th.
Both patients lived in Schwanheim, near the airport, but in separate households.
That brought the total to eight cases and three deaths, and it made the investigation a lot more complicated.
Further complicating things is that we know when these people became ill, but not exactly when they were infected.
With malaria, investigators can work backward from symptom onset to estimate a likely exposure window, but they usually can't identify the individual mosquito bite that transmitted the infection.
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