General information, not a diagnosis Method and limitations

FolderUnderstanding and preventing

Respiratory infections: reduce transmission

Not all respiratory agents are transmitted in the same way. A useful prevention combines several measures adapted to the location, the agent and the people present.

Topic updated:

Health professional exchanging with a patient in a light and ventilated waiting room
AI-generated illustration, not evidence of a health event. Indoor air, contact time and vulnerability of people change the risk to shared space.

EssentialShort answer

To be retained

The starting points

Improving indoor air, keeping a watchful eye on symptoms, washing hands, following recommended vaccinations and wearing a suitable mask in the situations indicated are complementary measures. In case of significant symptoms or worsening, contact a health professional or emergency services depending on the severity.

Deepen ▼

01Reference

Understanding situations at risk

Risk increases or decreases with several combined factors.

Shared air

In a closed space, ventilation and duration of presence count.

Proximity

Close and prolonged contacts can facilitate transmission.

Symptoms

A symptomatic person may transmit certain agents; the absence of symptoms is not always sufficient to exclude transmission.

Vulnerability

Age, certain diseases and immune status may change the risk of severe form.

02Reference

Linking the measures

No single measure covers all contexts.

Inland air

Maintain ventilation, ventilate where possible and avoid poorly ventilated premises.

Behaviours

Stay at home during illness when possible and follow local instructions.

Protection

Choose a suitable mask when recommended, taking into account fit and correct use.

Vaccination and hygiene

Consult the territory's vaccination recommendations and practice hand hygiene.

03Reference

Interpreting information

A recommendation may change with the circulation of agent and knowledge.

Agent

Distinguish flu, COVID-19, RSV and other infections when information is available.

Date

Check the season and date of update of the instructions.

Public

A measure for a care facility may differ from that for the general public.

Authority

Follow the health recommendations of the place of residence or residence.

LandPutting into context

Situations to be considered

Measures are strengthened according to symptoms, location, duration of contact and vulnerability of individuals.

One person is sick at home

Reduce close contact, renew air, respect hand hygiene and see if worrying signs appear.

A meeting will be held inside

Take into account the number of people, duration and ventilation; a CO2 sensor can help to detect a little new air.

A fragile person must be visited

Report if sick when possible; otherwise follow local instructions and discuss appropriate protections.

In practiceObserve and understand

Complementary barriers in a shared room

Useful measures depend on circulating viruses, time spent together and who is present. Air treatment addresses shared exposure; hand hygiene addresses contact transfer.

  1. Before meeting

    Choose a less crowded place and plan ventilation.

  2. During

    Follow protective guidance and improve the air.

  3. After

    Reassess if symptoms appear or guidance changes.

Complementary barriers in a shared room — explanations and limits
ObservationUseful questionAction to organise
Room occupied for a long timeIs outdoor air actually entering?Check that the ventilation works.
A vulnerable person is presentCan close contacts be reduced?Adapt arrangements and follow guidance relevant to that person.
Respiratory symptomsWhich guidance applies here?Consult local recommendations and seek advice as appropriate.
Keep in mind

Good ventilation does not replace other measures. A comfortable room can still allow transmission.

References for these explanations

Sources consulted on . Examples and diagrams are educational; the original guidance defines its scope.

QuestionsClarifications

Frequently Asked Questions

Is ventilation replacing other gestures?

No. It acts on the indoor air and complements other appropriate measures, including vaccination, hygiene and the protection of symptomatic people.

When can I ask for help?

In case of respiratory discomfort, severe symptoms or worsening, seek medical advice quickly; use emergency services if the situation is serious.

Does a ventilated room eliminate any risk?

No. Air renewal reduces particle accumulation in the air, but close contact and other transmission routes are still possible.

Can we identify the agent from the cough?

No. Many agents and other causes give similar symptoms; the context and, if necessary, tests guide the diagnosis.

Institutional sources

External sources can evolve. Check their date and instructions for your territory.

PratiqueCheck before deciding

Des mesures complémentaires

Reading guidance and interpretation limits
Concept or situationWhat it describesPoint to watch
Inland airRéduire l’accumulation de particules.Débit, entretien, occupation et possibilité d’aérer.
ContactsRéduire les occasions de transmission.Durée, proximité et présence de personnes vulnérables.
Personal protectionAdapter masque et vaccination au contexte.Un seul geste ne compense pas toutes les autres expositions.