It takes about 2 weeks after receiving seasonal influenza vaccine to develop immunity against influenza; during these 2 weeks you are liable to catch influenza.

1. There is no definite duration for the effectiveness of seasonal influenza vaccine, as body immunity against influenza decreases gradually by time.
2. Doctors recommend receiving seasonal influenza vaccine every year as influenza viral species are constantly changing, which means seasonal influenza vaccine from the previous year may not able to provide full protection against influenza in the current year.
3. The best timing for receiving seasonal influenza vaccine is in late October to ensure full protection throughout the influenza season.
4. Receiving seasonal influenza vaccine could involve temporary mild side effects such as; pain, redness and swelling at the site of the injection as well as low grade fever and generalized body ache.
5. Seasonal influenza vaccination is contraindicated in children younger than 6 months of age.
6. Seasonal influenza vaccination is highly recommended in the following:

• Children.
• Old age.
• Pregnant women.
• Patients with chronic debilitating diseases such as diabetes or cancer.
• Immunocompromised patients.