Influenza flu symptoms and treatment.

 

Influenza has been around for thousands of years what's the secret to its long existence the fact that it's constantly changing seasonal influenza or the flu is a respiratory infection caused by influenza viruses that circulate in all parts of the world there are three types of influenza viruses that infect humans types a b and c but types a and b commonly circulate to cause seasonal epidemics the flu killed millions of people for example in 1918 a flu pandemic infected a third of the earth's population and led to around 50 million deaths in just two years in temperate climates seasonal epidemics occur mainly during winter from October to march in the may occur throughout the year the most common symptoms are high fever cough muscle or joint pain headache severe malaise sore throat and a runny nose most people recover from fever and other symptoms within a week without requiring medical attention but it can cause severe illness or death especially in people at high risk seasonal flu spreads quickly with rapid transmission in crowded areas when an infected person coughs or sneezes droplets containing viruses are dispersed into the air and surfaces and can infect nearby people people with the flu should drink plenty of water and rest antiviral drugs can be used.

 

But antibiotics are not effective the best way to avoid getting the flu is to get the flu vaccine every year, especially in high-risk groups, and ideally just before the flu season begins flu viruses evolve constantly, and twice a year wh makes recommendations to update vaccines seasonal influenza outbreaks are caused by small changes in viruses that have already circulated and to which many people have some immunity a pandemic occurs when an influenza virus emerges that most people do not have immunity from because it is so different from any previous strain in humans this enables the strain to spread quickly between people once a pandemic virus has been established as with 2009 an h1n1 pandemic it can become a seasonal virus the good news is who has systems to monitor circulating viruses recommend vaccines and strengthen preparedness and response in all countries.

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