Cases are rising swiftly in 47 US states during the summer months. A new wave is surging nationwide. Data shows infection numbers increasing across the country. Health officials are tracking the fast spread with concern. Reports say this is happening prior to the usual flu season starting. Hot spots are concentrated in the central and southern regions. Experts point to more travel and less masking as reasons for the rise. Flu activity remains minimal for now. Hospitalizations have not risen yet. People are being told to keep taking precautions as the trend continues.