Often people wonder if it’s possible to contract the flu more than once in a single season. The answer, albeit surprising, is indeed yes. One could suffer from influenza more than once in a season, according to Dr. William Schaffner, a professor of preventive medicine and health policy at the Vanderbilt University Medical Center.
Dr. Schaffner explained that this happening is primarily because there are multiple strains of the flu virus circulating each year. An individual might contract one strain and then recover, only to fall ill with another strain later in the season. Influenza A and B are the main types that routinely spread in humans and cause seasonal epidemics, as per the Centers for Disease Control and Prevention (CDC).
It’s also worth noting that on top of the different strains of influenza, the flu vaccine isn’t 100% effective, further increasing the risk of contracting the illness multiple times. However, the vaccine can lessen the severity and duration of the illness. Despite not providing full protection, it is still recommended by health professionals, including those from the World Health Organization (WHO).
Another factor to consider when dealing with flu risk is the state of an individual’s immune system. A robust immune system can fend off the virus more easily, whereas people with weakened immune systems, such as the elderly, young children, pregnant women, and people with chronic medical conditions, are at higher risk of serious flu complications. These high-risk groups are specifically urged by the CDC to get vaccinated each year.
In summary, while it is rare, getting the flu more than once in a season is possible due to the variety of circulating strains, the effectiveness (or lack thereof) of the vaccine, and the individual’s immune system health. Individuals are encouraged to maintain healthy practices such as getting the flu vaccine, practicing hand hygiene, exercising regularly, and eating a balanced diet to reduce their risk.
Last modified: February 11, 2025
