The flu season is upon us, and it's packing a punch! But this time, there's a new player in town: the subclade K variant. It's causing quite a stir, with shoppers and holiday enthusiasts spreading more than just festive cheer.
A rising trend: In the week after Thanksgiving, the US witnessed a significant increase in doctor visits for flu-like symptoms, reaching 3.2%. This crosses the epidemic threshold, signaling the official start of flu season, according to Dr. Caitlin Rivers from Johns Hopkins Bloomberg School of Public Health.
The calendar vs. reality: Flu season is typically considered to begin in week 40, around early October. However, Dr. Rivers explains that this is just a calendar date, and flu activity is the true indicator. When flu activity hits 3.1%, it's game on!
A widespread concern: The CDC's latest update reveals moderate to high flu activity in at least 14 public health jurisdictions, primarily in the Northeast. New York City is a hotspot, while neighboring states like New York, New Jersey, Connecticut, Massachusetts, and Rhode Island are also affected. But it's not just the Northeast; Louisiana, Colorado, Georgia, South Carolina, Texas, Puerto Rico, and Idaho are also experiencing upticks.
A tragic first: Sadly, this week marked the season's first reported child death from the flu in the US.
A call to action: Dr. Tim Uyeki from the CDC's influenza division urges everyone to get vaccinated, emphasizing the rising influenza activity. But is this season shaping up to be worse than usual?
An early and intense start: In New York, cases started rising two weeks earlier than normal, according to Dr. James McDonald. Hospitalizations have been doubling weekly, and the curve is J-shaped, indicating a rapid surge in severe cases.
A new variant's impact: The subclade K variant, a strain of H3N2 influenza A, has been the dominant flu virus in American laboratories this season. This strain is known to cause more severe illness, especially in older adults.
Global trends: Busy flu seasons have been reported in Japan, China, the UK, and Canada. Australia, where subclade K was first identified, saw a record-breaking half a million confirmed flu cases.
Unpredictable nature: Despite these trends, flu season remains notoriously unpredictable. Dr. Jennifer Nuzzo from Brown University's Pandemic Center highlights the difficulty in predicting this year's severity, especially after last year's intense season.
A controversial twist: But here's where it gets controversial. Dr. Angela Rasmussen from the University of Saskatchewan predicts a bad flu season due to the new variant. However, the flu shots this year don't include this variant, as it was identified after the strains were chosen.
Vaccine effectiveness: A UK study found that while this year's vaccines may not neutralize subclade K as effectively, they still reduce the risk of hospitalization for H3N2 strains by 75% in children. The protection is lower for adults, but it's still a significant reduction.
A word of caution: Dr. Rivers warns that the US might not see the same vaccine effectiveness as the UK due to differences in vaccine production methods.
Vaccination and precautions: Dr. Alex Greninger from the University of Washington emphasizes that any protection is better than none. With flu season in full swing, getting vaccinated now is crucial. Additionally, wearing masks in crowded places and avoiding high-risk settings can further reduce the risk.
The importance of vaccination for children: Flu shots are especially vital for kids, who have less natural immunity. CDC data shows only 38% of kids have received flu shots this year, a concerning drop compared to previous seasons. Last season, the US saw a record number of child deaths from the flu, with the majority being unvaccinated.
Flu shots: not a guarantee, but a safeguard: While flu shots don't prevent infection, they significantly reduce the chances of needing medical attention. They also minimize the risk of transmitting the virus to others.
A multi-layered approach: Given the limitations of flu shots, taking multiple precautions is advisable. Dr. Rivers, for instance, combines vaccination with mask-wearing in crowded places and avoiding high-risk environments.
Additional measures: In situations where masking isn't feasible, like holiday dinners, opening windows or using air purifiers can help prevent the spread of germs.
Flu symptoms and testing: The flu hits hard and fast, with symptoms like high fever, cough, sore throat, body aches, and chills appearing simultaneously. If you get sick, consider getting tested early, as antiviral medications can help if started within 48 hours.
