When I got on the plane on Tuesday to fly from Tokyo to Singapore I felt healthy: I had just spent the weekend skiing in deep powder in Japan and was still glowing with joy and adrenalin.
A few hours into the flight, however, a fever spread across my body and my head started to hurt.
I took a couple of paracetamol, checked into the hotel when I landed and went to sleep, complacently assuming I had a heavy cold.
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