Definition: The word "influenza vaccine" refers to a series of vaccines that are used to protect against influenza, which is an infectious disease caused by influenza viruses. Influenza vaccines can be divided into three types: quadrivalent, trivalent, and trivalent A (trivalent vaccine containing only four doses). 1. Quadrivalent Vaccines: - The acronym "quadrivalent" stands for four doses of the same influenza virus. This means that there is a 10% chance of developing an infection from each dose. It is important to receive all four doses to protect against the disease. - Influenza vaccines are typically administered at approximately 2 weeks and then again at approximately 3 months, to ensure the immune system has had time to build up its defenses. 2. Trivalent Vaccines: - The acronym "trivalent" stands for trivalent, which means three doses of the same influenza virus. This is a combination of quadrivalent vaccines. - Trivalent vaccines are typically administered at 3 months and then again at approximately 5 months to ensure the immune system has had time to build up its defenses. 3. ATrivalent Vaccines: - The acronym "Atrivalent" stands for trivalent, which is a combination of three doses of the same influenza virus. This vaccine is often used in conjunction with a quadrivalent vaccine. - Atrivalent vaccines are typically administered at 6 months and then again at approximately 7 to 8 months. These types of vaccines are important because they provide a high level of protection against severe, more serious cases of influenza. They also allow for routine vaccination over multiple doses, which makes them easier and quicker to administer compared to other vaccines that require multiple doses.
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