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<p>Many people who have received the flu vaccine may have wondered why it is necessary to get vaccinated every year. They just got vaccinated last year, so why do they need to get vaccinated again this year? To clear up this doubt, <span style="color: #00826a;"><strong>Dr. Suwannee Rattanachuwong, an internist at the General Internal Medicine Clinic, Phyathai 3 Hospital, has reasons to explain.</strong></span></p>
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<h4 style="color: #008080;"><span style="color: #00826a;">Current Influenza Situation</span></h4>
<p>According to the outbreak data collected by the Department of Disease Control, in 2019, from January to February, there were 46,648 reported cases of influenza infection, with 4 deaths. In contrast, in 2018, the number of influenza patients was only 13,000-15,000, showing an increase of more than twice as much.</p>
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<p>There is a severe outbreak every 10 years. In 2009, a global outbreak occurred, and Thailand had as many as 120,000 influenza cases. Additionally, fluctuating weather and increasing PM 2.5 dust are important factors that contribute to the spread of influenza.</p>
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<h4 style="color: #008080;"><span style="color: #00826a;">Why do we need to get the flu vaccine every year?</span></h4>
<p>This is because the influenza virus changes its strains every year, which is a normal cycle for the virus to adapt for survival. The virus cannot survive long in the natural environment and dies quickly, so it needs to find ways to infect the human body. This is why we need to protect ourselves by getting vaccinated to build immunity against the virus that changes every year.</p>
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<h4 style="color: #008080;"><span style="color: #00826a;">When does immunity develop after vaccination?</span></h4>
<p>The influenza virus has a very short incubation period, averaging about 1-4 days before symptoms appear. Therefore, it is crucial to build immunity before the virus enters the body. Normally, immunity develops 10-14 days after vaccination.</p>
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<h4 style="color: #008080;"><span style="color: #00826a;">The earlier you get vaccinated&#8230; the lower the chance of infection</span></h4>
<p>Although we cannot achieve 100% immunity, those who receive the flu vaccine tend to have milder symptoms if infected compared to those who are not vaccinated. Unvaccinated individuals are at higher risk of complications, hospitalization, or death than those who have been vaccinated.</p>
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<p style="text-align: right;"><span style="color: #00826a;"><strong>Dr. Suwannee Rattanachuwong</strong></span><br />
Internist, General Internal Medicine Clinic<br />
Phyathai 3 Hospital</p>


Many people may have wondered why it is necessary to get vaccinated every year. Last year, they just got the shot, so why do they have to get it again this year? That is because the influenza virus changes its strains every year, which is the reason we need to protect ourselves from this virus by getting vaccinated.

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Why is the flu vaccine important? Why do you need to get it every year?

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