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Lung Disease & Respiratory Health Coronavirus Reference
An Inoperable Tumor In Your Lung
Coronavirus: What Happens When You Get Infected?
There are many types of coronaviruses. Some give you the common cold. The new coronavirus behind the 2019-2020 pandemic causes an illness called COVID-19.
How Does Coronavirus Attack Your Body?
A virus infects your body by entering healthy cells. There, the invader makes copies of itself and multiplies throughout your body.
The new coronavirus latches its spiky surface proteins to receptors on healthy cells, especially those in your lungs.
Specifically, the viral proteins bust into cells through ACE2 receptors. Once inside, the coronavirus hijacks healthy cells and takes command. Eventually, it kills some of the healthy cells.
How Does Coronavirus Move Through Your Body?
COVID-19, the illness caused by the coronavirus, starts with droplets from an infected person’s cough, sneeze, or breath. They could be in the air or on a surface that you touch before touching your eyes, nose, or mouth. That gives the virus a passage to the mucous membranes in your throat. Within 2 to 14 days, your immune system may respond with symptoms including:
Fever
A cough
Shortness of breath or trouble breathing
Fatigue
Chills, sometimes with shaking
Body aches
Headache
A sore throat
Congestion or a runny nose
Loss of taste
Loss of smell
Nausea or vomiting
Diarrhea
The virus moves down your respiratory tract. That’s the airway that includes your mouth, nose, throat, and lungs. Your lower airways have more ACE2 receptors than the rest of your respiratory tract. So COVID-19 is more likely to go deeper than viruses like the common cold.
Your lungs might become inflamed, making it tough for you to breathe. This can lead to pneumonia, an infection of the tiny air sacs (called alveoli) inside your lungs where your blood exchanges oxygen and carbon dioxide.
If your doctor does a CT scan of your chest, they’ll probably see shadows or patchy areas called “ground-glass opacity.”
For most people, the symptoms end with a cough and a fever. More than 8 in 10 cases are mild. But for some, the infection gets more severe. About 5 to 8 days after symptoms begin, they have shortness of breath (known as dyspnea). Acute respiratory distress syndrome (ARDS) begins a few days later.
ARDS can cause rapid breathing, a fast heart rate, dizziness, and sweating. It damages the tissues and blood vessels in your alveoli, causing debris to collect inside them. This makes it harder or even impossible for you to breathe.
Many people who get ARDS need help breathing from a machine called a ventilator.
As fluid collects in your lungs, they carry less oxygen to your blood. That means your blood may not supply your organs with enough oxygen to survive. This can cause your kidneys, lungs, and liver to shut down and stop working.
Not everyone who has COVID-19 has these serious complications. And not everyone needs medical care. But if your symptoms include trouble breathing, get help right away.
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What Else Does COVID-19 Do to Your Body?
Some people also have symptoms including:
Pinkeye
Rashes
Liver problems or damage
Heart problems
Kidney damage
Dangerous blood clots, including in their legs, lungs, and arteries. Some clots may cause a stroke.
Researchers are looking into reports of mouth sores and skin rashes, including reddish-purple spots on fingers or toes.
A few children and teens have been admitted to the hospital with an inflammatory syndrome that may be linked to the new coronavirus. Symptoms include a fever, rash, belly pain, vomiting, diarrhea, and heart problems. The syndrome, now being referred to as multisystem inflammatory syndrome in children, or MIS-C is similar to toxic shock or to Kawasaki disease, a condition in children that causes inflammation in blood vessels. We’re still learning about these cases.
WebMD Medical Reference
Reviewed by Hansa D. Bhargava, MD on July 24, 2020
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