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Why is Flu Season in the Winter?

Every year, millions of people fall victim to the flu, a contagious respiratory illness caused by the influenza virus. Interestingly, flu season tends to peak during the winter months, leading many to wonder why this is the case. In this blog post, we will delve into the science behind flu season and uncover the reasons why winter is the prime time for the flu virus to spread. 

Environmental Factors

Cold temperatures play a significant role in the seasonal occurrence of the flu. The influenza virus thrives in colder environments, with studies suggesting that it can survive and remain airborne for longer periods in low humidity and cool conditions. Dry winter air, coupled with decreased ventilation in closed spaces, provides the perfect environment for the flu virus to persist and spread easily from person to person.


Colder Weather and Human Behavior
During winter, people tend to spend more time indoors, seeking refuge from the cold. This increased indoor crowding creates ideal conditions for the flu virus to spread rapidly. Closer proximity to others facilitates the transmission of respiratory droplets, which contain the virus and are expelled through coughing or sneezing. Furthermore, with windows closed and less fresh air flowing into buildings, the concentration of airborne pathogens increases, making it easier for the flu virus to find new hosts.

Immune System Response
Our immune system plays a crucial role in defending against viruses, including the influenza virus. However, during the winter months, the immune system may be compromised, making individuals more susceptible to infection. Cold weather has been shown to negatively impact the immune response, slowing down the activation and effectiveness of immune cells. Additionally, reduced sun exposure during winter leads to lower levels of vitamin D, which is essential for a robust immune system. These factors, along with the higher prevalence of other respiratory infections during winter, weaken the body's defenses, making it more susceptible to the flu virus.


Altered Host Cells
Various studies have uncovered fascinating insights into how temperature affects both the influenza virus and human cells. Low temperatures in the nasal passages can impair the function of cilia, tiny hair-like structures that help in trapping and removing pathogens from the respiratory tract. When these cilia are compromised, it becomes easier for the flu virus to invade and infect the respiratory system. Additionally, cold temperatures can alter the consistency of mucus, making it thicker and less efficient at clearing viruses. These changes in the host cells' environment provide an advantage to the flu virus, allowing it to enter and replicate.


Fluctuating Humidity Levels

In addition to cold temperatures, winter is often associated with low humidity levels, especially in regions with colder climates. Dry air can lead to dry and cracked mucous membranes in the nose and throat, creating an ideal entry point for the flu virus. Furthermore, studies have shown
that low humidity can also decrease the immune response in the respiratory tract, making it more susceptible to viral infections. The lack of moisture in the air allows respiratory droplets containing the flu virus to travel further and remain suspended for longer periods, increasing the
chances of transmission.


 Virus Stability
The influenza virus is known to be more stable and viable in colder temperatures, contributing to its increased transmission during winter. The protective outer envelope of the flu virus helps it survive better in cool, dry conditions. Moreover, it has been observed that the lipid membranes
of the virus become more resistant during colder months, allowing it to survive on surfaces for a longer duration. This increased stability enhances the virus's ability to spread within communities, leading to a surge in flu cases during winter.

Weakened Mucous Membrane Defense
Our respiratory tract has a protective layer called the mucous membrane that helps in trapping and clearing out pathogens. However, in winter, the mucous membrane may become less effective due to the dry air and fluctuating temperatures. When the mucous membrane is compromised, it becomes easier for the flu virus to penetrate and cause infection.

Holiday Travel and Gatherings
The holiday season is a time for travel and gathering with loved ones, which can contribute to the spread of the flu. When people travel, they may come into contact with new viruses in different regions, increasing the likelihood of contracting the flu. Additionally, when people gather in groups for holiday events, it can create the perfect environment for viruses to spread. During the winter holidays, people also tend to share food, drinks, and utensils, which can be a breeding ground for germs. It’s important to practice good hygiene during this time, such as washing your hands frequently and sanitizing common surfaces to reduce the risk of getting sick. Research suggests that Vitamin D, Fish Oils, and Vitamin C can help immune system conditions though consult your doctor before taking supplements, to ensure these will not interact with any preexisting health conditions and prescriptions that you are prescribed.    


Flu season tends to hit in the winter due to a variety of factors. Understanding the science behind flu season helps us take necessary precautions to mitigate infection risks. While there’s no guaranteed way to avoid the flu, taking measures such as regularly washing your hands, staying hydrated, and getting enough vitamin D can help decrease your chances of getting sick.

Remember, prevention is key in combating the flu, and by staying informed and prepared, we can protect ourselves and those around us during this annual winter occurrence.

Eagle Medical Clinic has a convenient walk in clinic or long term family doctor . See the Walk-In clinic hours below and visit the Becoming a Patient page to learn how to sign up for the medical clinic for long-term individual or family medical care. 

Steps To Take For An Appointment With Our Doctors Office 




#2- Email the form to

Anyone wishing to make an appointment for long term family doctor services  can download this PDF form, fill it out and send it to us now.


Our Practice Hours

Monday: 9:00 AM - 5:00 PM
Tuesday: 9:00 AM - 5:00 PM
Wednesday: 9:00 AM - 6:00 PM
Thursday: 9:00 AM - 5:00 PM
Friday: 9:00 AM - 5:00 PM
* After hours patient appointments available outside of these weekday hours. 

doctors office speaking with patient
  • Can I see a specialist?
    Yes. You will be referred to an appropriate specialist from Eagles Landing Medical Centre. The consultation notes and any test results will be sent to your family doctor for review and addition to your medical record.
  • What if I leave Ontario?
    This network only applies within Ontario.
  • What happens if the Circle of Care is not a good fit for me?
    You are free to leave the practice at any time if you feel it is not a good fit. There is no obligation to stay. We are simply committed to a high standard of care with respect to your healthcare. Finally, if you are not able to keep your appointment, please call our office 24 hours ahead of time to cancel or reschedule your appointment to prevent a charge. If you agree to our policies, please sign below. Thank you for considering our practice and understanding our Circle of Care medical model. We have your health in mind, and we appreciate this mutual collaboration. If there are any questions, please contact us directly.
  • Is There a Doctors Office Nearby Me?
    It can be helpful to have a family doctor near you. Eagles Landing Medical Centre's doctors office in Maple are accepting new patients. We are located in Maple, Vaughan. You need to download the New Patient form on this page and email it to us. If you are not looking to become a long term patient, you can visit the Walk in clinic, it is first come, first serve only. Registered patients can only book appointment time. It pays to go through the new patient process to become a registered patient at Eagles Landing Medical Clinic. Learn more about how to get a family doctor for long term health care for you or your family.
  • Is It Hard to Book an Appointment with the Doctor's Office?
    New patients need to download, fill out and email us the new patient form. Once you have been notified that you are now a patient at Eagle Landing Medical Clinic you will be assigned a family doctor. After that, you can book online to get an appointment with your doctor or the on call doctor. View the doctor office hours on the website, and book family doctor appointments online on your own schedule. Once you have an assigned doctor, you can book after hours appointments. Walk in Clinic hours are separate from the family doctor hours. Walk in hours are first come, first serve only. Family doctor appointments are for registered patients for long term health care. Registered patients can book after hour doctors appointments with the Circle Of Care group of physicians only.
  • Can I Have the Same Family Doctor as My Family?
    Yes, you can make an appointment for your whole family. The doctor will want to understand your children's medical needs or a complicated health history in depth. This will make it easier for you to get the care you need at any time and help you avoid going back and forth between different physicians who may not be familiar with your medical history and treatments. Walk in Clinic hours are separate from the family doctor hours. Walk in hours are first come, first serve only. Family doctor appointments are for registered patients for long term health care. Registered patients can book after hour doctors appointments with the Circle Of Care group of physicians only. The Circle of Care doctors network have access to your families medical records when you book exclusively within the circle of Care network.
  • Why can't I go to a walk-in clinic?
    We offer convenient after-hours appointments within our network of care. For continuity of care, this system enables quick communication back to your family doctor, so he/she is up to date with your care.
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