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Respiratory virus vaccination guidance and developments

Updated 22 times since CLSTR started tracking revisions of this situation.

What changed

2026-10-22 23:24 UTC → 2026-10-26 02:14 UTC · added ~~removed~~

The respiratory virus vaccination season is underway across North America and globally, with a focus on influenza, COVID-19, and RSV. In the United States, Moderna’s mRNA-based mFLUSIVA is available for adults aged 50 and older, primarily through Walgreens pharmacies. While it may cause more side effects like fatigue, research suggests it may offer 27% more protection for certain groups. ~~The FDA has updated the 2026-27 flu vaccine components~~ Due to ~~align with circulating strains,~~ a court battle involving the CDC’s advisory panel, several major medical groups, including the ~~H3N2 subclade J.2.4.1. Health officials are warning~~ American Academy of ~~an early start to the flu season. Pediatric experts~~ Pediatrics, have ~~noted the high severity of the 2025-26 season, which saw over 180 reported pediatric deaths.~~ issued independent vaccination guidelines. In ~~Canada, immunization efforts are expanding. Following Quebec’s efforts to target high-risk populations, Alberta has~~ Alabama, health organizations have launched ~~its fall immunization program for~~ the ‘Prevent What You Can: Ask Your Doctor’ campaign to encourage residents to consult providers about influenza, COVID-19, ~~and~~ RSV, ~~with appointments becoming bookable via Health Link or online starting October 5. In Ontario, health authorities in Hamilton~~ and ~~Ottawa are urging preventative measures such as masking and handwashing as illness~~ pneumonia vaccines. In Oregon, the state epidemiologist noted that while transmission rates ~~rise. Starting October 26,~~ are currently low, flu ~~and COVID-19 vaccines will be available~~ positivity rates have recently risen from 3.5% to ~~residents through pharmacies and physicians. Ottawa~~ 5.3%. In Canada, officials ~~noted that these vaccines can be safely administered during the same appointment and~~ are ~~making specific efforts~~ preparing for a potential early peak. While Ontario has begun prioritizing high-risk groups, most provinces are expected to ~~reach eligible populations facing barriers, such as newcomers and children under age five.~~ offer free flu shots to the general public by the end of October. In Manitoba, health officials expressed concern over declining vaccination rates, noting that last year only 22% of residents received a flu shot. Global trends show varying impacts: in Argentina, respiratory infections account for 70% of outpatient consultations during winter. In the United Kingdom, the NHS is emphasizing seasonal wellness through Vitamin D supplementation. Experts suggest timing vaccinations in September or October to ensure immunity lasts through the peak period, typically between December and February.

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