We’ve all experienced that moment when a sore throat lingers, when a cough persists without knowing if it’s viral or bacterial, or that unexplained fatigue we attribute to stress. Common illnesses affect every household several times a year, and the challenge is not so much in naming them as it is in reacting correctly to the first symptoms.
Antibiotic resistance and unnecessary prescriptions: the trap of common infections
When consulting for a sore throat or bronchitis, the classic reflex is to request an antibiotic. The reality is that the majority of common respiratory infections are of viral origin. An antibiotic has no effect on a virus, and its inappropriate use directly contributes to antibiotic resistance.
The High Authority of Health has published recommendations to improve the relevance of prescriptions and limit this phenomenon. The WHO also classifies antibiotic resistance among the major global health threats. You can consult the disease page on Relais Santé to better understand the pathologies that truly require antibiotic treatment and those that resolve with rest and symptomatic care.
In practice, in the face of a respiratory infection without signs of severity (moderate fever, dry cough, nasal discharge), treatment relies on three pillars: rest, hydration, and simple analgesics like paracetamol. The use of antibiotics is only justified upon confirmation of a bacterial origin, often via a rapid test in the office.
Flu symptoms, cold, or respiratory infection: distinguishing to act better
The most common trap in daily life is confusing a simple cold with the flu or a more serious respiratory infection. The three share common symptoms (fatigue, congestion, headaches), but their management differs.
Cold and rhinopharyngitis
A cold is characterized by a runny nose, sneezing, and sometimes a slight sore throat. Fever is absent or very mild. It resolves spontaneously within a few days, without specific treatment. Nasal washing with saline and paracetamol are sufficient in the vast majority of cases.
Seasonal flu
The flu, on the other hand, strikes suddenly: high fever, intense body aches, fatigue that keeps you in bed. It is a virus to take seriously, especially in the elderly and patients with chronic illnesses. Vaccination remains the best preventive tool. Vaccination recommendations are updated each year by health authorities.
When to consult
You should consult if the fever lasts more than three days, if respiratory difficulties arise, or if symptoms worsen after an initial improvement. A deterioration after apparent improvement may signal a bacterial superinfection, particularly pneumonia.
STIs and screening: often silent signs
Sexually transmitted infections represent a category of common diseases where prevention and early diagnosis radically change the prognosis. The underlying problem is that many STIs do not cause any visible symptoms for weeks or even months.
- Chlamydia can remain completely asymptomatic, especially in women, while causing serious complications for fertility if left untreated.
- HIV may only manifest as a brief flu-like syndrome after infection, then enters a silent phase that can last for years without screening.
- Genital herpes causes intermittent outbreaks of painful lesions, but transmission remains possible even outside visible outbreaks.
Condoms remain the most effective means of prevention against the transmission of STIs. Regular screening is the second pillar, especially after unprotected intercourse or a change of partner. Tests are available in laboratories, free screening centers, and increasingly through self-tests for HIV.
Vaccination prevention: recent developments to know
Preventing common diseases is not limited to barrier gestures. Vaccination plays a central role, and recommendations are regularly updated based on epidemiological data.
Regarding respiratory infections, the High Authority of Health now recommends the VPC20 vaccine (Prevenar 20) for infants and at-risk children, as well as VPC21 (Capvaxive) primarily for at-risk adults and individuals aged 65 and older. These developments aim to expand coverage against pneumococcal infections, which cause pneumonia and meningitis.
Another notable advancement: the HAS recommended in June 2025 a systematic screening for cytomegalovirus (CMV) in pregnant women whose serological status is unknown or negative. CMV is a common cause of congenital infection, and this screening allows for proactive measures to reduce the risk of transmission to the fetus.
These updates show that prevention is not static. Checking your vaccination record with your doctor at least once a year helps ensure you don’t miss a recent recommendation, especially for at-risk populations.
Everyday preventive actions: what really works
We often repeat that certain preventive actions have a measurable impact on the frequency of common infections:
- Washing hands with soap for at least twenty seconds remains the most effective action against the transmission of digestive and respiratory viruses.
- Daily airing of living spaces, even in winter, reduces the concentration of pathogens in indoor air.
- Adhering to the vaccination schedule protects not only the vaccinated person but also those around them through collective effect.
- Using condoms during sexual intercourse with a new partner limits the spread of STIs, including those that circulate without symptoms.
Prevention relies on simple habits applied consistently, not on one-off solutions. Feedback varies on the perceived effectiveness of certain supplements or so-called natural remedies, but no solid data places them on the same level as the measures listed above.
Understanding common illnesses is primarily about knowing when to act and when to wait. A viral sore throat is not treated like a bacterial infection, a silent STI is only detected through voluntary screening, and vaccination recommendations evolve each year. Maintaining this reflex of verification with your doctor or pharmacist is already a form of active prevention.
