Health authorities are investigating the cause of flu-like symptoms among learners at Mweshipandeka Secondary School in the Oshana Region.

Johanna Haimene, the Health Director in the region, told Nampa on Sunday that all the affected learners had infections of the upper respiratory tract.

However, all 69 affected learners tested showed negative results for COVID-19.

She said COVID tests were done and no positive result was detected.