Flu Cases 2025. National influenza centres (nics) and other national influenza laboratories from 131 countries, areas or territories reported data to flunet for the time period from 13 may. It causes 290 000 to 650 000 respiratory deaths annually.

Cdc analyzes data on influenza viruses and associated morbidity and mortality each influenza (flu) season. Some countries conduct universal influenza surveillance, meaning that all cases meeting the relevant case definition are reported.