Dubai Winter: Difference Between Rhinovirus Infections and Influenza Flu Published on: 3rd February 2023 Medically reviewed by: General Practitioner at First Response Healthcare Influenza (flu) is an infection of the nose, throat, and lungs, all of which form part of the respiratory system. Influenza commonly referred to as the flu, is different from the stomach flu virus, which causes diarrhea and vomiting. Most patients recover on their own, however, sometimes the flu and its complications can be fatal. The influenza vaccine, however, can reduce the complications caused by an infection. This is why it becomes essential to get an influenza shot. People who are at increased risk of developing flu complications include the following: Infants under 2 years old Adults over 65 years old Residents of nursing homes Women who are pregnant or plan to get pregnant during flu season People who have weak immune systems American Indians or Alaska Natives People with chronic diseases such as asthma, heart disease, kidney disease, liver disease, diabetes People who have a BMI (body mass index) of 40 or more Getting an influenza shot becomes absolutely necessary under the above-mentioned cases.