Amid a gradual increase in Covid-19 cases in Delhi in recent days, some medical experts say the new XBB.1.16 variant could be driving the rise in cases but add there's no need to panic and people should follow Covid-appropriate behaviour and get booster shots if they have not already. They also say this rise could be a result of more people getting themselves tested for Covid as a precaution when they actually get infected with the influenza virus and develop fever and related ailments.