Flu Season Sees Significant Spike in Cases Across the US
New data from the Centers for Disease Control and Prevention (CDC) reveals a substantial increase in flu cases nationwide, with some areas experiencing record-breaking numbers. As of December 20, the CDC estimates that there have been at least 7.5 million flu cases, 81,000 hospitalizations, and 3,100 deaths. Furthermore, eight flu-related pediatric deaths have been reported.
The CDC’s latest report indicates that 32 jurisdictions are currently showing “high” or “very high” levels of flu activity, a significant jump from the 17 jurisdictions reported last week. These jurisdictions include all 50 states, some territories, the District of Columbia, and New York City. The CDC uses the proportion of outpatient visits to healthcare providers for influenza-like illnesses, including fever, cough, or sore throat, to measure flu activity levels in each jurisdiction.
The New York State Department of Health reported a record-breaking 71,000 flu cases for the week ending December 20, the highest number ever recorded since tracking began in 2004. Additionally, over 3,600 flu hospitalizations were recorded in the state during that week. Similarly, the Massachusetts Department of Public Health reported “high” flu activity, with Boston announcing a 114% increase in recent flu cases, primarily among children.
Expert Insights and Concerns
Experts have expressed concern about this year’s flu season, citing the emergence of a new subtype of influenza A called H3N2, which is spreading rapidly. According to the CDC, of 2,086 specimens that tested positive for flu between December 13 and December 20, 2,029 had influenza A, with nearly 92% of those being H3N2. Jesse Bloom, a scientist at the Fred Hutchinson Cancer Center who studies viral evolution, notes that the virus has undergone sufficient changes to make it harder for people’s immune systems to recognize the illness.
Richard Webby, director of the World Health Organization’s Collaborating Centre for Studies on the Ecology of Influenza in Animals and Birds, mentions that while experts are expecting a “H3N2 mismatch,” the vaccine’s match to H1N1 and flu B is expected to be good. Early season data from the United Kingdom suggests that the vaccines are still effective in preventing severe illness, especially in children. Bloom emphasizes the importance of getting vaccinated, particularly for high-risk groups, as it can mitigate the risk of infection.
Fewer people have received flu shots this year, with approximately 130 million doses administered nationwide, according to the CDC. As the flu season continues to evolve, it is essential to stay informed and take preventive measures to minimize the risk of infection. For more information and updates, visit the CDC website or consult with a healthcare professional.
Edited by Alex Sundby
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