Getting your annual flu vaccine is the single most effective step you can take to avoid the flu, cutting your risk of infection by roughly 40 to 60 percent depending on the season and your age. But vaccination works best as part of a layered approach that includes good hand hygiene, smart habits during flu season, and enough sleep to keep your immune system functioning well.
Get Vaccinated Before Flu Season Peaks
The flu vaccine remains the cornerstone of prevention. Preliminary CDC data from the 2024–2025 season shows the vaccine reduced outpatient flu illness by about 54 to 56 percent in adults across the largest surveillance network, and by 59 to 60 percent in children and adolescents. For hospitalizations, the numbers were even more striking in kids: vaccination cut flu-related hospital stays by up to 78 percent in children.
Protection isn’t instant. It takes about two weeks after vaccination for your body to build enough antibodies to fight the virus, so the best time to get your shot is in September or October, before flu activity typically ramps up. That said, getting vaccinated later in the season still helps. Protection does wane over time, which is one reason a new shot is recommended every year.
One detail worth knowing: sleep matters more than most people realize when it comes to how well the vaccine works. Men who were sleep-deprived the night after vaccination produced roughly 60 percent fewer antibodies five days later compared to those who slept normally. Even in the two nights before your appointment, short sleep has been linked to a weaker antibody response that persists for months. So if you’re scheduling your flu shot, try to get a solid night’s rest on either side of it.
Wash Your Hands for at Least 20 Seconds
Flu spreads through respiratory droplets, but also through contact. You touch a contaminated doorknob, then touch your nose or mouth, and the virus has a direct route in. Handwashing is the simplest way to break that chain.
Scrubbing for at least 20 seconds removes significantly more germs than shorter washes. Evidence suggests the sweet spot is somewhere between 15 and 30 seconds of active lathering, and most global health organizations have landed on 20 seconds as the standard recommendation. Use soap and water when available. Alcohol-based hand sanitizer (at least 60 percent alcohol) is a reasonable backup when a sink isn’t nearby, but soap and water is the stronger choice for visibly dirty hands.
The moments that matter most: after using the restroom, before eating, after blowing your nose or coughing into your hands, and after touching shared surfaces in public spaces like elevator buttons, grocery carts, or transit handrails.
Keep Your Hands Away From Your Face
The flu virus enters your body through your eyes, nose, and mouth. Studies on surface survival show that influenza A and B viruses can live on hard, nonporous surfaces like stainless steel and plastic for 24 to 48 hours. On softer materials like cloth, paper, and tissues, the virus survives for less than 8 to 12 hours. That means the desk at work, your phone screen, and kitchen countertops can all harbor live virus for a full day or longer.
Keeping your hands away from your face is harder than it sounds. Most people touch their face dozens of times per hour without realizing it. Being conscious of the habit helps, especially in high-traffic environments during peak flu months.
Avoid Close Contact During Outbreaks
The flu spreads most efficiently in close quarters. If someone near you is coughing or sneezing, maintaining distance reduces your exposure to the respiratory droplets that carry the virus. During active flu outbreaks, crowded indoor settings like public transit, waiting rooms, and large gatherings carry the highest transmission risk.
If someone in your household is sick, practical steps can reduce spread: have them use a separate bathroom if possible, wipe down shared surfaces regularly with an EPA-registered disinfectant labeled for influenza, and avoid sharing towels, utensils, or drinking glasses. The sick person is most contagious in the first three to four days of illness, though they can spread the virus starting a day before symptoms even appear.
Prioritize Sleep and Basic Health Habits
Your immune system doesn’t operate in a vacuum. Chronic sleep deprivation weakens your body’s ability to fight off infections and, as noted above, blunts your response to the vaccine itself. People with chronic insomnia show significantly weaker immune responses after flu vaccination compared to those who sleep well. Aiming for seven to nine hours of sleep per night during flu season is one of the most underrated prevention strategies.
Regular physical activity, staying hydrated, and managing stress also support immune function in general terms. None of these replace vaccination or hand hygiene, but they create a baseline of immune readiness that makes your body better equipped to fight the virus if you’re exposed.
Extra Steps if You’re at Higher Risk
Certain groups face a much greater chance of serious complications if they catch the flu. The CDC identifies these high-risk categories:
- Age: Adults 65 and older, and children younger than 2 (with infants under 6 months facing the highest hospitalization and death rates)
- Chronic conditions: Asthma, COPD, diabetes, heart disease, kidney disease, liver disorders, sickle cell disease, and neurological conditions
- Weakened immune systems: From HIV, cancer, chemotherapy, radiation, or long-term use of immune-suppressing medications
- Obesity: A BMI of 40 or higher
- Pregnancy: Including the first two weeks after delivery
- Stroke survivors and people with certain disabilities that affect muscle function, lung function, or the ability to cough and clear airways
- Residents of nursing homes and long-term care facilities
People in these categories should be especially diligent about getting vaccinated early in the season. If you live with or care for someone at high risk, your own vaccination protects them too by reducing the chance you’ll bring the virus home. During peak flu weeks, it’s reasonable for high-risk individuals to wear a mask in crowded indoor settings and to be more aggressive about hand hygiene and avoiding sick contacts.
What About Vitamin C and Zinc?
Vitamin C and zinc are among the most commonly searched supplements for flu prevention. While both play legitimate roles in immune function, clinical evidence supporting their ability to prevent influenza infection specifically is thin. Zinc lozenges may modestly shorten the duration of common colds if taken early, but the common cold and the flu are caused by entirely different viruses. There’s no strong trial data showing that supplementing with vitamin C or zinc will stop you from getting the flu. Your effort is better spent on vaccination, hand hygiene, and sleep.