Regions on the rise include parts of Asia, North America, and Europe.
The highest flu positivity rates were in the Mountain, south central, southeast, and West Coast regions.
Media reports describe overwhelmed children's hospitals in multiple locations in China.
Hospitalizations, also on the rise, are highest in seniors and young children.
Most flu viruses were influenza A, and of subtyped samples, about two-thirds were H3N2.
Hospitalizations are also up, especially in seniors and young children.
The Traveler-based Genomic Surveillance program will expand to provide early detection of flu and other respiratory viruses.
COVID-related hospitalizations are up a bit, flu-like illness is climbing, and officials confirm more avian flu outbreaks on poultry farms in 5 states.
Influenza A is most common, with H3N2 seen in about two-thirds of subtyped samples.
In influenza news, US flu cases appear to be rising, and officials have confirmed more avian flu outbreaks in US poultry.
Many public health preparedness directors had to tap into state or national antiviral stockpiles.
Test positivity is still very low, and most subtyped samples are the H1N1 influenza A virus.
A few counties are reporting high levels of hospitalizations, especially in the Upper Midwest and West.
The first phase of work focuses on an antibody that broadly protects against circulating SARS-CoV-2 variants.
Wastewater testing rose in prominence during the COVID-19 pandemic.
Flu remained at low levels overall, but with elevated activity in some parts of Asia and Central America.
Flu was tied to 7,851 deaths from week 33, 2022, to week 12, 2023, compared with 32,607 deaths tied to COVID-19.
Southeast Asia's flu levels remained elevated, including in Cambodia, Myanmar, and the Philippines.
Pakistan has its second wild poliovirus type 1 case of the year, 4 countries report rising mpox, and the WHO has new resources.
Flu activity is on the downslope in the Southern Hemisphere, and globally influenza A is dominant with H3N2 and H1N1 proportions nearly equal among subtyped samples.
Having 2 or more underlying medical conditions raised the risk of ICU admission, mechanical ventilation, and in-hospital death.
Of positive flu samples at national labs, 68.5% were influenza, and of subtyped samples, 66.2% were the 2009 H1N1 virus.
The rates the researchers saw could serve as a baseline for gauging whether coinfections rates are shrinking or growing.
A study found that the recombinant influenza vaccine provided better protection against hospitalization than the standard-dose vaccine.
A roundup of infectious disease stories in the news.