Flu questions answered: N95s, crowds, precautions, and the 2-metre rule

Seasonal influenza continues to circulate, prompting questions about how best to protect oneself and others. While staying home when unwell and maintaining respiratory hygiene are recommended, the use of masks is a topic of debate. The Delhi Medical Association and Indian Medical Association suggest mask use for those with flu symptoms, especially in crowded or healthcare settings, while ICMR Director General Dr. Rajiv Bahl recommends routine mask use is not necessary for everyone.

Dr. Sulaiman Ladhani, a Consultant Pulmonology, explains that these recommendations may not be contradictory as they reflect varying levels of precaution. A mask can be particularly useful when a person with flu symptoms cannot avoid being around others, such as in crowded or poorly ventilated settings. However, routine mask use by healthy individuals is not required.

An N95 respirator offers higher filtration and may be useful in close contact situations, like at home with family members at higher risk. However, masking should not replace staying home and limiting close contact while unwell. Dr. Ladhani clarifies that influenza transmission is not strictly limited to a two-metre distance, as respiratory particles of different sizes can spread during close contact, particularly in crowded or poorly ventilated indoor environments.

The flu vaccine is not recommended for everyone as part of India's immunisation programme, but those at high risk, such as adults aged 65 and over, pregnant women, young children, and individuals with certain medical conditions, may choose to get vaccinated after consulting their doctor. The vaccine recommended for the northern hemisphere is preferred, as it is likely to be closer to the circulating strains and offer better protection.

People with flu symptoms should stay home, avoid close contact, improve ventilation, practice good hand hygiene, and cover their mouth and nose when coughing or sneezing. Those with symptoms should also avoid meetings and close interactions with colleagues at work, and seek medical attention promptly if they experience severe symptoms.