Most people don’t think of the flu as deadly.
Because they have likely had the flu and didn’t die…
What Makes the Flu So Deadly?
It surely doesn’t help that even after a natural infection, we don’t build up immunity to protect us from flu viruses in subsequent years. Or that even though the flu vaccine isn’t as effective as we would like, many people don’t get vaccinated and protected.
Mostly, the flu is deadly because it can lead to severe symptoms in many people, even otherwise healthy people.
Although most people associate the flu with a fever, runny nose, cough, and body aches, the flu virus can rarely cause a primary viral pneumonia. Even when it doesn’t, an influenza infection can make it harder to breath. The flu virus can also cause severe bronchiolitis, like RSV does, croup, and can trigger asthma attacks.
Other severe complications that can be deadly include:
- bacterial superinfections
- myocarditis (inflammation of the heart) and pericarditis
- congestive heart failure
- encephalitis (inflammation of the brain)
- myositis (inflammation of our muscles)
- toxic shock syndrome
- multi-organ failure
More rarely, the flu can cause Guillain-Barrésyndrome and Reye syndrome (associated with taking aspirin).
“Most people who get flu will recover in a few days to less than two weeks, but some people will develop complications (such as pneumonia) as a result of flu, some of which can be life-threatening and result in death.”
CDC on Flu Symptoms & Complications
But why do some people develop these flu complications and die, while others don’t?
That’s the real question most people want answered, not what the flu does to our body and how the flu virus attaches to and enters our cells, replicates, destroys our cells, triggers an immune response, and causes symptoms.
If you must know, you can likely blame it on a combination of the virulence factors of the flu virus strain and host factors of the person who is infected, but mostly, it’s because the flu can be a deadly disease.
That’s when you get worsening flu symptoms and signs, which might include trouble breathing, chest pain, dehydration, irritability, lethargy, confusion, or persistent vomiting, etc.
More on Flu Deaths
- Flu Symptoms: When To Bring Your Child Into The Emergency Center
- Families Fighting Flu
- Fight the Flu Foundation
- CDC – Flu Symptoms & Complications
- CDC – Seasonal Flu and Staph Infection
- WHO – Up to 650 000 people die of respiratory diseases linked to seasonal flu each year
- Sepsis and Influenza
- The pathogenesis of influenza virus infections: the contributions of virus and host factors
- Influenza 101
- Pathogenesis of influenza in humans
- David and Goliath: How one cytokine may take down influenza
- How many people die from influenza?
- Influenza Pandemics
- Why we vaccinate–because the flu can be deadly to healthy people
- Cure Your ConFluSion
- Pandemic Influenza Storybook
- Only the good die young; Kelly’s story of influenza
- Parents PACK Personal Stories – Influenza