Flu Cases Surge 1.5x in a Week, 13 Straight Weeks of Growth — Okinawa Tops Chart at 26.27 Per Clinic

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The story

The Ministry of Health, Labour and Welfare reported that the number of flu patients per fixed-point medical institution nationwide reached 8.48 for the week ending September 20, up about 1.5 times from 5.54 the previous week. This marks the 13th consecutive week of increases. By prefecture, Okinawa topped the list with 26.27, followed by Tokyo at 15.21, Aichi at 15.12, and Kanagawa at 14.71. On 5ch threads, various theories flew back and forth over why Okinawa’s numbers stood out — from the impact of foreign tourists to a rebound effect from insufficient indoor ventilation during the COVID pandemic — alongside ongoing exchanges about vaccine effectiveness, side effects, and personal experiences.

The number of flu patients reported per medical institution is up about 1.5 times from the previous week.

According to the Ministry of Health, Labour and Welfare, a total of 31,428 patients were reported from fixed-point medical institutions nationwide during the week ending September 20, working out to 8.48 per institution.

That’s roughly 1.5 times the 5.54 recorded the previous week, marking 13 consecutive weeks of increases.

Source: news.yahoo.co.jp / Original article here

What people said

2AnonymousSep 29, 2026 14:42
Anti-vaxxers, assemble!
153AnonymousSep 29, 2026 15:56
Re: #2
Wasn't Okinawa — the highest number — also the one with a low vaccination rate?
4AnonymousSep 29, 2026 14:43
Influenz-encer! (a pun blending 'influenza' and 'influencer')
It'll all work out, Okinawan-style! (nankurunaisa — Okinawan dialect for 'it'll be fine')
30AnonymousSep 29, 2026 14:50
No friends, live out in the boonies, pretty much always alone, so I probably won't catch it…
Though I do have some contact with people at work.
32AnonymousSep 29, 2026 14:51
Re: #30
You'll catch it from a delivery package.
31AnonymousSep 29, 2026 14:51
Influencer, influenza — which is which?! So confusing!
47AnonymousSep 29, 2026 15:00
Re: #31
Neither one lasts very long, right?
93AnonymousSep 29, 2026 15:15
Re: #31
Influencers do more damage.
39AnonymousSep 29, 2026 14:54
This one feels like COVID, must be some new strain.
The infection rate is terrifying.
41AnonymousSep 29, 2026 14:58
Re: #39
Have you gotten the so-called 'COVID vaccine'?
If you haven't yet, please help protect your loved ones by getting the so-called '~mRNA COVID vaccine~'. Let's all achieve herd immunity together 💪
42AnonymousSep 29, 2026 14:58
Compared to COVID, the flu's infectiousness is laughably weak.
51AnonymousSep 29, 2026 15:02
Don't worry, everyone! Just get the so-called 'flu vaccine' and you'll be fine! Safe and sound!
56AnonymousSep 29, 2026 15:02
Why is Okinawa so far ahead of everyone else?
64AnonymousSep 29, 2026 15:06
Never gotten a flu shot in my life, and never caught the flu either.
Though I might've just been asymptomatic.
86AnonymousSep 29, 2026 15:12
Re: #64
I used to catch the flu almost every year.
My kid would bring it home from kindergarten or school,
and I'd catch it on the train too.
Since COVID, I think I've maybe had it once.

Flu shots were mandatory when I was little, but I haven't gotten one since becoming a working adult.
65AnonymousSep 29, 2026 15:06
I feel like I saw news a while back about Chinese hospitals getting swamped with patients again…
But wasn't that about some new strain of COVID?
109AnonymousSep 29, 2026 15:31
Re: #65
Just check hospital parking lots via military satellite, you'll know right away. (a nod to the early-COVID meme of spotting outbreaks from satellite images of packed hospital lots)
87AnonymousSep 29, 2026 15:13
The fact that they stopped doing COVID forecasts is probably a factor too.
Nobody wears masks or sanitizes their hands anymore these days — that's probably contributing as well.
89AnonymousSep 29, 2026 15:13
Re: #87
COVID's been spreading year-round anyway.
92AnonymousSep 29, 2026 15:14
Re: #87
Lately I actually feel pressure to take my mask OFF, if anything.
105AnonymousSep 29, 2026 15:29
It's a mystery why it's spreading so much in Okinawa —
people move around just as freely in Tokyo.

According to the Okinawa Times:
'Kids didn't catch the flu during COVID'
'Because we kept the windows closed'
111AnonymousSep 29, 2026 15:32
Re: #105
Wait, did they seriously print that??? Wasn't it an Okinawan doctor or scholar early in COVID who kept saying 'ventilation, ventilation is everything!'?
198AnonymousSep 29, 2026 16:29
Re: #105
> By prefecture, Okinawa had the most at 26.27, followed by Tokyo at 15.21, and so on.

Tokyo's spreading too.
Guess Miyazaki really is its own isolated island (despite being on the mainland).


Flu 'advisory' drawing near — up 1.5x from last week, increase continues
https://www.tokyo-np.co.jp/article/518452
…31,428 cases were reported during that period.
By prefecture, the highest per-clinic count was Okinawa at 26.27, followed by Tokyo at 15.21, Aichi at 15.12, and Kanagawa at 14.71.
All 46 prefectures except Miyazaki have now exceeded 1, the threshold marking the start of an epidemic.
162AnonymousSep 29, 2026 16:01
Flu cases were rising, so they shut down widespread flu vaccination programs.
Already forgotten after 30 years?
166AnonymousSep 29, 2026 16:05
Re: #162
It's not that they forgot — they probably never knew in the first place.
80% of people only care about celebrities and athletes; there's no way truly important information ever reaches them.
186AnonymousSep 29, 2026 16:22
Re: #162
Don't talk nonsense — routine vaccination for the elderly was resumed back in 2001.
167AnonymousSep 29, 2026 16:06
I'm in the anti-flu-shot camp, but I'm currently down with Influenza A.
First time I've ever had the flu, and it's rougher than COVID.
Nearly 40°C fever, joint pain, and crushing fatigue.
Everyone wash your hands.
170AnonymousSep 29, 2026 16:07
Re: #167
If you'd gotten the shot, your symptoms would've been milder.
Well, that's the flu for you.
173AnonymousSep 29, 2026 16:10
Re: #170
Oh wow, what devout faith lol
Keep it up and go get the so-called mRNA COVID vaccine too lol
175AnonymousSep 29, 2026 16:11
Re: #170
That's beside the point.
It only helps prevent severe illness, nothing more.

Background and key points of this topic

The flu’s fixed-point reporting system tracks the average number of patients reported by roughly 5,000 medical institutions nationwide per institution, with a reading above “1” marking the start of an epidemic. This time, 46 of Japan’s 47 prefectures (all except Miyazaki) have crossed that threshold, with especially high numbers in urban areas and the southwestern islands such as Okinawa, Tokyo, Aichi, and Kanagawa. Posters in the thread never reached a consensus on why Okinawa stands out so much — theories ranged from the movement of foreign visitors to a rebound effect from avoiding indoor ventilation during the COVID pandemic — but it’s worth noting none of this is confirmed by actual reporting. There was also plenty of back-and-forth over vaccination and side effects, but the flu itself produces a certain number of complication cases every year, and there’s no medical evidence of a recent sudden surge. The oft-cited “10 times last year’s level” figure may also simply reflect the fact that last year was a record low, which makes a straightforward comparison misleading.

*This article is excerpted and summarized from the 5ch (News Express+) thread “Flu case numbers over 10 times the same period last year, up about 1.5x from the previous week, 13 straight weeks of increase, Okinawa highest at 26.27, followed by Tokyo at 15.21.”

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