Cases are rising quickly in 47 US states during the summer months. A new wave is spreading nationwide. Data shows infection numbers jumping across the country. Health officials are tracking the fast spread carefully. Reports say this is happening ahead of the usual flu season starting. Hot spots are concentrated in the central and southern regions. Experts point to higher mobility and lower mask usage as reasons for the rise. Flu activity remains undetected for now. Hospitalizations have not climbed yet. People are being told to keep taking precautions as the trend continues.