A man infected with H5N2 bird flu, the first confirmed human infection with the strain, died from multiple factors, the WHO said on Friday, adding that investigations were ongoing.

The World Health Organization on Wednesday announced that the first laboratory-confirmed human case of infection with H5N2 avian influenza virus had been reported from Mexico.

Mexico’s health ministry said the 59-year-old man had “a history of chronic kidney disease, type 2 diabetes (and) long-standing systemic arterial hypertension”.

He had been bedridden for three weeks before the onset of acute symptoms, developing fever, shortness of breath, diarrhoea, nausea and general malaise on April 17.

The man was taken to hospital in Mexico City a week later and died that day.

“The death is a multi-factorial death, not a death attributable to H5N2,” WHO spokesman Christian Lindmeier told journalists in Geneva on Friday.

His body was tested for flu and other viruses, and H5N2 was detected, Lindmeier said.

Seventeen hospital contacts were identified but all tested negative for influenza.