Every autumn, as the cold returns, so does the flu: high fever, intense muscle pain, exhaustion that keeps you in bed for days and, in some people, complications that can lead to pneumonia or hospital admission. The good news is that there is a simple, safe and thoroughly studied way to avoid it: the flu vaccine. And the right time to get it is not in the middle of the outbreak, when the virus is already circulating: it is now, between October and November, before the season starts.

Why do you need a flu shot every year?

The flu virus has a particular trait that makes it especially slippery: it changes. Its surface proteins mutate each season, which is why the vaccine is updated every year to match the strains expected to circulate that winter. This means two things: last year’s protection is no longer fully valid this year, and each autumn a new formulation is released, designed from the recommendations of the WHO and epidemiological surveillance systems.

The immunity the vaccine builds is effective, but not everlasting: it fades over the months. Getting vaccinated in autumn guarantees that your body has produced antibodies (which takes about two weeks) right when the flu starts to spread, and that this protection lasts the whole winter.

Who should get vaccinated (and why almost everyone can benefit)

Vaccination campaigns prioritise the groups with the highest risk of complications:

• People over 60: age is the main risk factor for flu-related hospital admission.
• Pregnant women at any stage: flu increases the risk of premature birth and serious complications for the mother.
• People with chronic conditions: diabetes, asthma, COPD, heart disease, kidney failure, immunosuppression or obesity.
• Professionals who deal with the public or work in close teams, and household members of vulnerable people or of babies under 6 months (who cannot be vaccinated yet and depend on the immunity of those around them).

But the truth is that any healthy person who wants to avoid a week in bed, protect their family or not lose working days can also get vaccinated. The more immunised people there are in a community, the harder the virus finds its way to the most fragile: that is called herd immunity.

Busting myths: the vaccine cannot give you the flu

This is the most common doubt in the consultation room, and it has a clear answer: the vaccine contains inactivated virus or fragments unable to multiply, so it cannot cause the disease. What may happen is a small local soreness in the arm or a mild low-grade fever the next day: that is the sign your immune system is learning to recognise the virus, and it disappears within 24–48 hours.

It is also true that the vaccine is not 100% infallible against infection, because the virus changes and several strains circulate at once. But even when it does not prevent infection, it makes the illness much milder, shorter and far less likely to cause complications. And no, catching “the real flu” is not the better option: a genuine flu bout can be harsh, unpredictable and contagious, with no advantage over the immunity the vaccine provides.

Getting vaccinated also protects your schedule and your wallet

Thinking about it in practical terms helps: a typical flu means 4 to 7 days of fever and exhaustion, plus one or two weeks of residual tiredness. For a working person, that is lost days; for a parent or a carer, a serious logistical problem; and for someone with an underlying condition, a real risk. A five-minute jab in consultation, with a prior review of your medical history and no waiting, is the autumn health investment with the best cost-benefit ratio.

Prepare your winter at SanySa del Levante

At SanySa del Levante we administer the flu vaccine in consultation, by appointment, with a previous assessment of your medical history and personalised recommendations from our general practitioners. If you belong to a risk group, or you simply want to reach January without having fallen ill, book your appointment now: protection takes about two weeks to fully develop, so every week of October–November that goes by is an opportunity the virus will happily take.