On World Flu Day, Flu Topped The Positivity Charts — How Do You Defend The Invisible Line inside Your Home?

1. Start with this week's surveillance data

November 1 was the 9th World Flu Day. The latest weekly influenza surveillance report from the Chinese Center for Disease Control and Prevention (China CDC) shows the autumn-winter flu season is gradually opening:

l Among influenza-like illness (ILI) cases at outpatient and emergency departments, influenza positivity has ranked first among all respiratory pathogens;

l This round is dominated by influenza A(H3N2) — nearly 70% of positive influenza A samples — with influenza B as a secondary strain;

l Experts judge that the current low-level circulation will enter an upward trend from late November into December;

l The Shanghai CDC has reminded the public that the flu season has begun, and now is the prime window for priority groups to get vaccinated.

Experts at Ruijin Hospital note that this round's H3N2 tends to feel more severe — even a 26-year-old patient took about two weeks to fully recover. Children, the elderly, pregnant women, and people with chronic conditions face higher risks of severe illness.

2. The real transmission chain at home runs through the air

The flu vaccine is the first line of defense — no argument there. But beyond the vaccine, there is one more thing worth doing: taking care of the air in your hundred-odd square meters of home.

The reason is simple — winter is when families spend the most time together in shared spaces. One person catches the flu, and with doors and windows sealed, droplets and aerosols circulate between the living room and the bedrooms. Many households get "patient wears a mask, washes hands often" right, but miss the air part of the chain.

Health authorities consistently recommend opening windows for ventilation. But opening windows in November is a tug-of-war: cold air outside, elderly family members and children inside — 15 minutes of open window, and half the room's warmth is gone.

3. Three ways the KJ-15BA responds

l DBD plasma technology, safe for people and machines together: rated 99.99% inactivation of bacteria and viruses in the air (manufacturer's laboratory data; actual results vary with conditions), acting on both air and surfaces — the room stays usable while it runs, unlike UV disinfection which requires everyone to leave;

l 5 dB quiet operation + dual-duct whole-home circulation in 3 minutes: the living room and bedrooms take turns being covered; running in the bedroom at night is inaudible. It can run all night in a child's or grandparent's room, unnoticed;

l AIoT remote monitoring: during the days when someone at home has the flu, check the unit's operating status and data from the office via the app — easier than phoning home to ask whether anyone turned it on.

4. The household flu-season checklist, in order of priority

First, the vaccine. It can be given throughout the season. Sooner is better than later; later is better than never — that is the experts' own wording.

Second, ventilation. Even in cold weather, open windows 2–3 times a day for 10–15 minutes.

Third, air treatment as backup. The hours when windows stay shut belong to the equipment — especially overnight and when the home is empty.

Fourth, isolate the patient. If someone at home is infected, keep them in a separate room where possible, with separate meals and bathroom arrangements.

Closing thoughts

Flu season comes every year, and this year it arrived a little earlier than usual. The vaccine is "human defense"; air management is "environmental defense." Walk on both legs, and that invisible line at home actually holds.