Updated Dec 10, 2020 | 14:06 IST With winter setting in, doctors have started getting sporadic cases of seasonal influenza. People have to be careful as this is the season for other viral infections like rhinovirus. Covid season Kolkata with smoke and fog sees increased chances of viral diseases | Photo Credit: AP Kolkata: Experts have warned that the weather, fluctuating temperature, fog and the increasing pollution can lead to many health problems if the people do not take precautionary steps. With winter setting in, doctors have started getting sporadic cases of seasonal influenza. Bhaskar Narayan Chaudhury, microbiologist, told the Times of India, “People have to be careful as this is the season for other viral infections like rhino, adenovirus and syncytial, which is a respiratory virus.”