In this blog post, we explore why annual flu vaccinations are necessary and how to prepare for viral mutations. Let’s examine effective prevention and response methods together.
The season for flu vaccinations is upon us once again. Recent news reports frequently mention the potential for a significant flu outbreak. Looking back a few years, there was even a time when the world was affected by the swine flu. Like this, the flu quietly resides around us in our lives. However, the common perception of the flu is that it’s just a severe cold. But unlike a simple cold, the flu can cause serious complications and can be fatal, especially for the elderly, children, or those with weakened immune systems. Therefore, preventing the flu should be recognized as a crucial issue not only for protecting individual health but also for public health. Let’s explore the prevention and treatment of influenza, arguably the quintessential viral infectious disease.
The flu, or influenza, is a viral disease. Therefore, explaining influenza inevitably requires explaining viruses. To explain viruses as simply as possible, a virus is an organic mass containing specific instructions. These specific instructions can be summarized into two commands: “Multiply!” and “Spread widely!” The instructions necessary to carry out these two commands are encoded in the sequence of nucleic acid molecules. These core nucleic acid molecules are surrounded by a protein-based capsid. This is the most fundamental structure of a virus.
The influenza described in this article is also a disease caused by infection with the influenza virus. Influenza viruses are broadly classified into types A, B, and C, with type A being the most commonly encountered. You’ve likely heard virus names like H1N1 or H5N1 in the news; these are precisely the influenza A viruses. The letters H (hemagglutinin) and N (neuraminidase) in these names refer to specific proteins contained within the virus’s capsid, as explained earlier. There are 18 types of H and 11 types of N proteins. The combination of these proteins determines the virus type. Theoretically, this means there are 198 types of influenza A viruses. Understanding the structure and characteristics of the virus is a crucial foundation not only for treating influenza but also for overall virus research and vaccine development.
Can knowing the virus type help prevent influenza? One of the most common things heard about influenza is that you need to get vaccinated again every flu season. This is often explained by the rapid mutation rate of influenza viruses, suggesting they become completely different variants within a year. However, this is only partially true. Another reason re-vaccination is necessary is because it’s impossible to predict which specific virus type will circulate. As explained earlier, there can be 198 types of influenza A viruses. Among these, about ten strains primarily infect humans. Which of these viruses will become prevalent can only be determined as the flu season approaches. Preparing the appropriate vaccine is essential for preventing the flu. Furthermore, vaccines activate the immune system. When the vaccine is administered, the immune system recognizes specific proteins of the virus and produces antibodies against them. The flu outbreak in the spring of 2015 occurred precisely because this prediction was incorrect. For this reason, and because even if the same strain circulates, it mutates significantly into a different variant within a year, annual flu booster shots are necessary.
Despite vaccination policies, no year passes without flu patients. Consequently, numerous treatments for influenza have been developed alongside vaccines. The most prominent treatment is Tamiflu. Tamiflu is such an effective medication that the U.S. CDC recommends administering it within 48 hours to patients at high risk of complications. This Tamiflu acts on the N protein of the influenza virus described earlier. The role of the N protein is to assist the virus in being released from the cell after replication. Tamiflu inhibits this process, preventing further spread of the virus. However, prevention is more important than relying on treatment. Strengthening immunity through vaccination and maintaining strict personal hygiene are essential to preventing the spread of influenza.
Thus, the principles of preventing and treating influenza, a viral disease, are grounded in the scientific characteristics of the influenza virus. This applies not only to diseases like influenza but to all diseases that can affect humans. Ultimately, understanding viruses and the research that follows is central to continuous medical advancement. The more accurate our research and predictions regarding viral mutations become, the more effective vaccine development will be possible. This is why progress in basic science is essential for the advancement of medicine.
