Restart Mexican-flu ? H1N1

[url]https://www.rivm.nl/griep-griepprik/feiten-en-cijfers#standvanzaken[/url] or https://www.rivm.nl/griep-griepprik/feiten-en-cijfers#standvanzaken from week 50 here in NL there is an increase of the Mexican-like H1N1 flu...

[url]https://www.rivm.nl/en/flu-and-flu-vaccine/facts-and-figures[/url] or https://www.rivm.nl/en/flu-and-flu-vaccine/facts-and-figures 

[url]https://en.wikipedia.org/wiki/2009_swine_flu_pandemic#Epidemiology[/url] or https://en.wikipedia.org/wiki/2009_swine_flu_pandemic#Epidemiology ;

The 2009 swine flu pandemic, caused by the H1N1/swine flu/influenza virus and declared by the World Health Organization (WHO) from June 2009 to August 2010, was the third recent flu pandemic involving the H1N1 virus (the first being the 1918–1920 Spanish flu pandemic and the second being the 1977 Russian flu).^[12][13] The first identified human case was in La Gloria, Mexico, a rural town in Veracruz.^[14][15] The virus appeared to be a new strain of H1N1 that resulted from a previous triple reassortment of bird, swine, and human flu viruses which further combined with a Eurasian pig flu virus,^[16] leading to the term "swine flu".^[17]

Some studies estimated that the real number of cases including asymptomatic and mild cases could be 700 million to 1.4 billion people—or 11 to 21 percent of the global population of 6.8 billion at the time.^[9] The lower value of 700 million is more than the 500 million people estimated to have been infected by the Spanish flu pandemic.^[18] However, the Spanish flu infected approximately a third of the world population at the time, a much higher proportion.^[19]

The number of lab-confirmed deaths reported to the WHO is 18,449^[10] and is widely considered a gross underestimate.^[20] The WHO collaborated with the US Centers for Disease Control and Prevention (USCDC) and Netherlands Institute for Health Services Research (NIVEL) to produce two independent estimates of the influenza deaths that occurred during the global pandemic using two distinct methodologies. The 2009 H1N1 flu pandemic is estimated to have actually caused about 284,000 (range from 150,000 to 575,000) excess deaths by the WHO-USCDC study and 148,000–249,000 excess respiratory deaths by the WHO-NIVEL study.^[21][22] A study done in September 2010 showed that the risk of serious illness resulting from the 2009 H1N1 flu was no higher than that of the yearly seasonal flu.^[23] For comparison, the WHO estimates that 250,000 to 500,000 people die of seasonal flu annually.^[24] However, the H1N1 influenza epidemic in 2009 resulted in a large increase in the number of new cases of narcolepsy.^[25]

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[url]https://en.wikipedia.org/wiki/Spanish_flu[/url] or https://en.wikipedia.org/wiki/Spanish_flu ;

The 1918–1920 flu pandemic, also known as the Great Influenza epidemic or by the common misnomer Spanish flu, was an exceptionally deadly global influenza pandemic caused by the H1N1 influenza A virus

DJ Others go for a wider time-line 1917-1923. 

It may be "interesting" to see how H1N1-flu -with also CoViD damage widespread- will work out...

[url]https://app.powerbi.com/view?r=eyJrIjoiZTkyODcyOTEtZjA5YS00ZmI0LWFkZGUtODIxNGI5OTE3YjM0IiwidCI6ImY2MTBjMGI3LWJkMjQtNGIzOS04MTBiLTNkYzI4MGFmYjU5MCIsImMiOjh9[/url] or https://app.powerbi.com/view?r=eyJrIjoiZTkyODcyOTEtZjA5YS00ZmI0LWFkZGUtODIxNGI5OTE3YjM0IiwidCI6ImY2MTBjMGI3LWJkMjQtNGIzOS04MTBiLTNkYzI4MGFmYjU5MCIsImMiOjh9 

H1N1pdm09 never was away...Was a big problem in the southern hemisphere last may-july (winter there)...Brazil did see very high numbers of this variant last april, may...

[url]https://www.cdc.gov/respiratory-viruses/whats-new/flu-and-JN.1-update-2024-01-22.html[/url] or https://www.cdc.gov/respiratory-viruses/whats-new/flu-and-JN.1-update-2024-01-22.html ;

CDC tracks spread of influenza viruses

While COVID-19 continues to cause more hospitalizations than influenza and respiratory syncytial virus (RSV), right now, more people are going to emergency departments to get care and being diagnosed with flu than COVID-19. With seasonal flu activity elevated across the country, CDC is tracking which influenza viruses are most common, where they are occurring, and how this might impact the public’s health. Since the fall, emergency department visits have been increasingly driven by flu. While some recent data suggest flu may have peaked, CDC is watching closely for a second wave of flu activity, which happens during many seasons.

The mix of influenza viruses circulating varies by region, but the most commonly reported influenza viruses this season are type A(H1N1) and type B viruses. This might mean more severe outcomes among people who are hospitalized with flu this season. A study by CDC found that A(H1N1) and B viruses caused severe illness more frequently among hospitalized patients compared to A(H3N2) viruses. More severe illness could create greater demand for healthcare, potentially increasing strain on hospitals.

The fact is that every flu virus has the potential to cause serious illness, regardless of which virus it is. Vaccination can help prevent the most serious effects of flu, but as of January 6, 2024, it is estimated that 46.8% of the adult population was vaccinated in the United States for the 2023-2024 season.

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[url]https://www.ecdc.europa.eu/sites/default/files/documents/communicable-disease-threats-report-week-1-2024.pdf[/url] or https://www.ecdc.europa.eu/sites/default/files/documents/communicable-disease-threats-report-week-1-2024.pdf (page 7/10);

Among the 249 sentinel primary care detections of seasonal influenza, 243 were typed as influenza virus type A and six were typed as influenza virus type B. Of the influenza type A detections, 58% (n = 142) were further subtyped as either A(H1)pdm09 (n = 127) or A(H3) (n = 15). Three of the influenza type B detections were further subtypes as B/Vic.

page 8/10;

Influenza WHO recommends that trivalent vaccines for use in the 2023–2024 influenza season in the northern hemisphere contain the following (egg-based and cell culture or recombinant-based vaccines respectively): an A/Victoria/4897/2022 or A/Wisconsin/67/2022 (H1N1)pdm09-like virus (subclade 5a.2a.1); an A/Darwin/9/2021 or A/Darwin/6/2021 (H3N2)-like virus (clade 2a); and a B/Austria/1359417/2021 (B/Victoria lineage)-like virus (subclade V1A.3a.2). During weeks 40–52, 2023, 233 A(H1)pdm09, 102 A(H3) and 12 B/Victoria viruses from sentinel and non-sentinel sources were genetically characterised. Of the A(H1)pdm09 viruses, 90 were reported as clade 5a.2a and 143 were subclade 5a.2a.1. Of the A(H3) viruses, two were reported as clade 2a.3a and 100 were subclade 2a.3a.1. All of the B/Victoria viruses were reported as subclade V1A.3a.2.

DJ....a lot of the wiki-info is 2009 related...